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Journal of Magnetism and Magnetic Materials 21 (1980) 69-79 © North-Holland Publishing Company A 6 T ULTRASONIC STUDY OF THE MAGNETOELASTIC COUPLING IN FERROMAGNETIC Co-Pt ALLOY J. ROUCHY, E. du TREMOLET de LACHEISSERIE, J.C. GENNA Laboratoire Louis N~el, Laboratoire propre du CNRS, associJ ~ l'Universit~ Scientifique et M~dic/ale, 166 X - 38042 Grenoble.Cedex, France and A. WAINTAL Laboratoire de Cristallographie et Service National des Champs Intenses, 166 X - 38042 Grenoble-Cedex, France Received 19 September 1979; in revised form 19 February 1980 The theoretical description of the sound-wavepropagation in ferromagnets is briefly summarized. An original apparatus is then described which allows a 6 T magnetic field to be applied either parallel to the sound propagation k or rotating in the plane perpendicular to k; this provides a convenient method for studying Simon, morphic and rotational effects. Some preliminary experiments have been performed on single crystals of disordered Co-Pt alloy, and the six morphic coefficients determined. 1. Introduction The sound velocity in ferromagnetic crystals depends on their magnetic state, through magnetoelastic coupling. Beyond technical saturation, three main mechanisms may be invoked, namely: - The Simo n effect, a field dependent contribution to the cii's varying roughly as 1-1-1, usually referred to as the ~ 0 magnetoelastic dispersion, and first studied in great detail by Simon [1]. - The morphic effect that is not explicitly dependent on the magnetic field strength but depends on the magnet- ization orientation with respect to crystallographic axes. It was first recognized by Mueller [2] and analysed by Mason [3]. Eastman [4] pointed out the existence of anharmonic contributions which are as important as the second-order magnetoelastic coupling. - The rotational and magnetostrictive effects that could not be predicted by the linear theory of elasticity but are derived from the rotational invariance and finite strain theories, first invoked by Tiersten [5] and Brown [6] in ferromagnetism (see appendix). A number of interesting papers have been written on these topics but it is not the place in this experimental work to cite them. The reader is referred to a recent work [7] for a more abundant bibliography. Our present purpose is to illustrate these three mechanisms by some experiments on disordered equiatomic Co-Pt crystals. This alloy was chosen for his relatively important magnetoelastic coupling, leading to frequency shifts large enough to be easily observed by means of a standard pulse.echo technique. Theory is very briefly reviewed in section 2, since it has been extensively developed in ref. [7]. The experimen. tal apparatus is described in section 3, while the data are given in section 4 and discussed in section 5. 69
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members of the Anti-Opium League, especially those who Ihave no knowledge of local conditions. The Asiatic tempera-ment must be taken into account and requires very carefultreatment in matters of such importance as the regulating ofan appetite for a mental excitant such as opium. The

pleasant sensations that follow a morphine injection are notlikely to remain long a secret to those who, having beenrudely divorced from their habitual use of opium, are search-ing about for some means of satisfying the almost irresistible- craving which their systems feel for it..March 10th.

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AUSTRALIA.

(FROM OUR OWN CORRESPONDENT.)

Ke1/) Lunatic Asylum.THE Government of Victoria has decided that the Kew

Asylum grounds shall be sold and the asylum eventuallyremoved. The present building has been long condemned bythe official visitors as overcrowded and structurally deficient.A site has been purchased at Heidelberg which is a verypicturesque suburb about eight miles from Melbourne. The

present building will be retained for benevolent cases untilother provision is made.

The Site of the Melbourne Hospital.The question of a suitable site for rebuilding the Melbourne

Hospital continues to be a fruitful topic of controversy. Thechoice was considered to lie bstween rebuilding on the

present site or moving to what is known as the " pigmarket "-a larger area about a mile farther from the city.The Premier recently introduced a new factor by offering thehospital committee an area of 15 acres in what is at

present a reserve surrounding the Government House set.apart for the Governor-General since the inauguration ofthe Commonwealth. This site is ideal from the standpointof natural beautv but it is situated on the south side ofthe river Yarra and would have three other general hos-pitals within a radius of one and a half miles. It is objectedthat if the present site is abandoned the new hospital shouldbe moved to the north, as the northern suburbs contain thegreat bulk of the poorer population. Another objectionwhich has been strenuously urged is that the GovernmentHouse reserve should be retained for a pleasure ground. The.medical staff of the hospital decided some time ago by a sub-stantial majority in favour of the " pig-market site, but onthe Premier’s offer being made a number altered their view,and a majority is now in favour of moving across the river.The popular objection to this course appears to be so strong,however, that it is possible that the offer may be withdrawn.Meanwhile the hospital committee accepted it subject to theagreement of the Wilson Fund trustees, whose gift of £100,000carries the right of approval. This approval was withheld andthe Premier called a conference of various public bodiesinterested in the question. No result was arrived at by thismeeting and it is now announced that the hospital committee.will itself come to a definite conclusion. Had this beendone at the outset a great deal of time and discussion wouldhave been saved, for public opinion was prepared to supportthe committee in anything decided upon until it weakly.accepted the suggestion to cross the river.

Mortality among Boarded-out Infanfs.During the recent heat wave in Melbourne it was reported

by a female inspector that several infants in the care of aregistered nurse were in a dying condition. They wereremoved to the depot for neglected children and five of themdied there within a week, while another succumbed a fewdays later. The cause of death in each case was given ascolitis or entero-colitis. The nurse in question had no fewerthan 12 children under her care. The police inspectorreported favourably on his knowledge of the conduct of thisplace and the coroner eventually concluded that there was noevidence for committal and intimated that the authorities

might take further action. The Chief Secretary has directed.a prosecution.

Munioipal Dispensaries for Sydney.A movement has been made in the city council of Sydney

to establish municipal dispensaries. A motion was carriedinstructing the city solicitor to prepare a clause in the nextamending Bill giving the council power to establish dis-pensaries in the city.

, The Un’iversity of Sydney.The medical school is expanding so greatly that it has been

found necessary to remodel the present school and also tomake considerable additions to the building. The new wingwill consist of a stone building three storeys in height, theexterior of which will correspond with the existing block,and the cost will be .E20,OOO. The school as rebuilt will beconnected by a handsome cloister with the PathologicalMuseum. On the ground floor of the new wing there will bea bacteriological class-room, laboratory, and preparation-room, with a lecture-room for pathology. The first floor willinclude class-rooms for materia medica and surgery. A newmuseum of anatomy will also be provided.

A Remarkable Case.A curious case of mental aberration from overstrain has

occurred in one of the suburbs of Melbourne. An old lady,aged 81 years, had been for some two years entirely bed.ridden. She was nursed by a daughter, a woman aged 53years, and mother and daughter were so attached thatneither would permit any other attendant, although suchwas available. A neighbour noticing an offensive smellcommunicated with the police, who discovered that the oldlady had been dead for more than a week. The daughterwas in a dazed condition and could give no account of theoccurrence except the statement that she thought her motherwas asleep. Relatives had called at the house three or fourdays previously and had been informed that the patient wassleeping and was not to be disturbed. When visited by thepolice the daughter had apparently not taken her clothes offfor at least three days, nor was there any evidence that shehad partaken of any food during that time. She has sinceentirely recovered her mental balance.

Vital Statistics.The estimated population of Sydney district on Dec. 31st,

1907, was 550,600. The birth-rate for the year was equal to26’ 32 per 1000 of the population, which is the highestrate recorded for many years. 10’ 1 per cent. of these birthswere illegitimate. The death-rate was 11-45 per 1000;the infant mortality rate was 96’ 3 per 1000 births. Thedeath-rate was unusually high among children, which isaccounted for by the effect of a dry season and the pre-valence of epidemic whooping-cough.

The Danysz Microbe.A conference of the chairmen of State boards of public

health was held in Sydney to consider the advisability orotherwise of permitting the liberation of the Danyszrabbit microbe on the mainland. The conference con-

sisted of Dr. Frank Tidswell of New South Wales;Dr. W. P. Norris, Victoria; Dr. W. Ramsay Smith,South Australia ; Dr. J. S. C. Etkington, Tasmania;and Dr. Lovegrove, Western Australia. The questionsreferred for consideration were: (1) whether the microbefound amongst rabbits on the mainland is identical withthat suggested by Dr. Danysz for the destruction of rabbits;and (2) whether it is advisable to continue the experimentsin the mainland with the Danysz microbe. With regard tothe first question the conference concluded "that the microbesuggested by Dr. Danysz is specifically identical with themicrobes isolated from rabbits captured on the mainland ofAustralia." As to the second query the conference con-

cluded that under natural conditions the virus would notinjuriously affect animals other than rabbits failing theinfluence of some circumstances at present unforeseen.After having considered all the evidence the conferencefound that while there was no reason to apprehendinjury to animal life in general neither was there anyreason to expect any effective destruction of rabbits by theuse of the virus. The importation of the virus being nowprohibited by Commonwealth law the conference recom-mended that the prohibition should be maintained. Thismeans that the Government will not undertake any furtherexperiments, nor will it permit private persons to do so.The scheme may practically be regarded as.defunct.

Sydney Hospital.The annual meeting of subscribers to the Sydney Hospital

was held on Feb. 18th under the presidency of Sir HarryRawson, the State Governor. The past year was the mostactive and progressive in the history of the institution. 4935in-patients were treated, of whom 376 died ; the proportionof deaths, after deducting those ocourring within 24 hoursafter admission, was 5’ 7 per cent. 2245 operations were

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performed at Sydney and 520 at the Moorcliff branch. Thefinances are more satisfactory. The present Governnient paida subsidy of £35 per bed on 295 beds. The total expenditurewas .624,812, while the income amounted to .631,909. Thecost per bed was £73 lls. 6d. A new wing was completed ata cost of .BZ3,000.March 4th.

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Medical News.EXAMINING BOARD IN ENGLAND BY THE ROYAL

COLLEGES OF PHYSICIANS OF LONDON AND SURGEONS OFENGLAND -At the first professional examination held onMarch 23rd, 24th, 25th, 26th, 27th, 28th, and 30th,the following gentlemen were approved in the subjectsindicated :-Chemistry and Physics.-William Somerset Birch, King’s College ;Kenneth Bleckly Clarke and John Stanley Cocks, Guy’s Hospital;William Dale, Birkbeck College; John Rhys Davies, UniversityCollege, Cardiff; Alfred Evan Lewis Devonald, King’s College;William Kelsey Fry, Wandsworth Technical Institute ; Harold

Stanley Groves, Guy’s Hospital; William Samuel Hazell, Univer-sity College, Cardiff; Hugh Granville Hockridge, St. Bartholo-mew’s Hospital; Edmund Basil Jardioe, University College; EvanLawrence Jones and Kenneth John Taylor Keer, Guy’s tiospital;Gordon Burnham King, University College; Allan Osborne Knight,Middlesex Hospital; Edmund Thomas Howard Lea, Westminsterand King’s College Hospitals; Edward MacMahon Mahon, Guy’sHospital; Reginald Victor Martin, St. Mary’s Hospital; CharlesHarold Medlock, Guy’s Hospital; John Millard, IntermediateCounty School, Towyn, and Birmingham University; Alan VivianMoberly and Montague Pern, Guy’s Hospital; D’Arcy Power,St. Bartholomew’s Hospital; Walter Alexander Reynolds, St.Mary’s Hospital; John William Thomas, Leeds University;Watkin Watkins, University College, Cardiff; Hamlet MarkWhelan, University College, Cardiff; John Herbert Wiles, Poly-technic Institute; and Leslie Douglas Wright, Guy’s Hospital.

Chemistry.-Harold Cane Godding, Guy’s Hospital; James StanleyHiggs, St. George’s and Kiog’s College Hospitals; SamuelHutchinson, University College ; George Gerald Jack, TechnicalInstitute, Wandsworth; Hubert Dennis Shore, Guy’s Hospital;and Henry Stanley Young, Birkbeck College and St. Thomas’sHospital.

Physics.-Alfred Beuthin Danby, Guy’s Hospital; John BaptistGregory Dotto, St. Bartholomew’s Hospital; Frank MainwarningHughes, London Hospital; Guy Algernon Pratt, Guy’s Hospital;Marcus Holroyd Ratton, Guy’s Hospital and Birkbeck College;Walter Graham Reynolds, St. Mary’s Hospital; Anthony WellesleyMonckton Sawyer, University College; Abdel Khalfk Selim, Guy’sHospital; Harold Tuxford, Middlesex Hospital; and WilliamCuthbert Whitworth, Guy’s Hospital.

Biology.-Charles Beresford Alexander, Liverpool University; EdgarBernard Argles, St. Mary’s Hospital; Stephen Leonard Baker,London Hospital; Hugh Woodward Barnes, King College; CyrilArmand Bernard, Liverpool University; Henry Cecil Btllings,London Hospital; William Herbert Blakemore, Manchester Univer-sity ; Thomas Pennington Bremner, Liverpool University; BertramJames Brewitt and Roger Orme Bridgman, St. Bartholomew’s Hos-pital ; William Hackett Broughton, Manchester University; CharlesGrinling Bunn, B.A.Cantab., Cambridge University and Charing

- Cross Hospital; Charles Frank Burton, London Hospital; GuyKenneth Butterworth, St. Mary’s Hospital; Alfred Fisher Camp,University College, Reading; Kenneth Bleckly Clarke, Guy’s Hos-pital ; Henry Dyer Scott Close, St. Thomas’s Hospital; AlfredBeuthin Dauby, Guy’s Hospital; John Rhys Davies, UniversityCollege, Cardiff; Eustace Gregory Edward Ellman, St. Mary’s Hos-pital ; Frank Rex Fletcher, London Hospital; Victor William RussellForbes, Charing Cross Hospital; Edward Dance Fountain, St. Mary’sHospital; Frank Cane Godding, Guy’s Hospital; Samuel SowrayGreaves, Leeds University; Francis Henry Guppy, St. Bartholo-mew’s Hospital; Owen Gwatkin, Manchester University; WilliamSamuel Hazell, University College, Cardiff; Shai Kwong Ho,St. Thomas’s Hospital ; Henry Sydney Colchester Hooper, LondonHospital; William Edward Ison, St. Bartholomew’s Hospital;Thomas Henry Jackson, Charing Cross Hospital; Edmund BasilJardine, University College ; Evan Lawrence Jones, Guy’s Hos-pital ; Ralph Jones, Charing Cross Hospital; William Ben GlynnJones, Liverpool University ; Gordon Burnham King, UniversityCollege; Claude Kingston, University College, Bristol; AllanOsborne Knight, Middlesex Hospital; John Llewellyn David Lewis,Guy’s Hospital; Farquhar MaeGillivray Loughnane, St. Thomas’sHospital; Josiah Sherlock Marrington Arthur Haigh Lyne-Evans,St. George’s and University College Hospitals; William FidlerMason, Leeds University; Percy Uvedale Mawer, St. Bartholo-mew’s Hospital; Owen Colville Morphy, Middlesex Hospital;Lionel Everard Napier, St. Bartholomew’s Hospital; HenryBarton Owens, Robert Charles Parry, and Henry Ray Parsloe,London Hospital; John Rowland Payne, University College,Cardiff ; Leonard Robert Pickett, Tonbridge School; OswaldPitt, Manchester University; Stanley Owen Rashbrook, LondonHospital; Geoffrey Bower Richardson, St. Bartholomew’s Hos-pital ; Joseph Edward Rivera, Manchester University; Alex-ander Elder Saunderson, Liverpool University; Anthony Welles-ley Monekton Sawyer, University College; Bernard EdwardPatrick Sayers, Middlesex Hospital; Frederic Simpson, CharingCross Hospital; Lindsay Clive Smith, London Hospital; ThomasJoseph Taunton, Technical School, Brighton; Arnold RothwellTaylor, Manchester University ; Harold Topham, Leeds Univer-sity ; Arnold Viney, St. Thomas’s Hospital; Clement ArthurWebster, Manchester University; Leslie Gordon White, Leeds University; and Stanley Wickenden, Guy’s Hospital.

ROYAL COLLEGE OF SURGEONS OF ENGLAND.-At the Preliminary Science Examination for the Licence inDental Surgery of the Royal College of Surgeons of Englandthe following candidates were approved in the subjects..indicated :-

Chemistry and Physics.-Richard Guy Ash, Charing Cross Hospital rStanley Samuel Beare, Middlesex Hospital; John Benson, MerchantVenturers’ Technical College, Bristol; Walter Sydney Bevis, Ports-mouth Grammar School; Oscar Bullock, Municipal Technical’College. Brighton; Reginald Northey Curnow, Birkoeck College;-Cecil Lucas Donne, Middlesex Hospital; Reginald Gilbert

Farrington, Guy’s Hospital; Robert Daniel Gregg, Liverpool,University; William Ewart Hallinan, University College, Cardiff pAlbert Henry Herbert; Birmingham University; Kenneth GeorgeHoby, Guy’s Hospital; Ernest Sharman Huckett, PortsmouthGrammar School; George Dennis Iles, Leeds Technical Institute;William Lowe Jackson, Charing Cross Hospital; Frederic AmosJaques, Guy’s Hospital ; Percy Hills Orton, Guy’s Hospital;.Arthur Hugh Spencer Palmer, Merchant Venturers’ TechnicalCollege, Bristol; Haydu Peters. Technical College, Swansea ;,Reginald Wood Powell, Guy’s Hospital; John Hampden Ross,Royal Albert Memorial College, Exeter; Edward Bernard Ryley,Municipal Technical School, Hull; Isidore Gittleson Samuels,Royal Albert Memorial College, Exeter; Reginald Alfred Slade,-University College, Bristol; and Basil William Tyson, UniversityCollege, Cardiff.

Chemistry.-Harold Barrett, Birkbeck College ; Arnold John Chap-man, Birkbeck College ; John Eric Rhys Evans, Municipal TechnicalCollege, Brighton; Thomas Leonard Fiddick, Guy’s Hospital;-John Knowles, Charing Cross Hospital; Ronald Victor Payton,.Municipal Technical School, Birmingham; William Macqueen.Potter, Birkbeck College; Frederick Gordon Pulford, CharmgCross Hospital ; Wilfrid Aubrey Rowe, Charing Cross Hospital; 9Frank Percival Sturdee. Northern Polytechnic Institute, Holloway;Samuel Lloyd Wallis, Wandsworth Technical Institute; and EdgarOlyve Yerbury, South-Western Polytechnic Institute, Chelsea,

-Physics.-Kenneth Charles Brough, Birkbeck College; GrahamCotterell, Science and Art Institute, Walsall; James KennethCrawford, Leeds Technical Institute; Henry Oswald Dumayne,.Birkbeck College ; Arthur Raymond Goddard, Middlesex Hospital;. -.

Lawrance Richards Haydon, Charing Cross Hospital; James StaceyRobinson, Municipal Technical School, Birmingham; ArnoldVictor Shilton, Birmingham University; and Malcolm LloydWilliams, Science and Art Institute, Walsall.

UNIVERSITY OF LEEDS.-At examinations heldrecently the following candidates were successful :-

DEGREES OF M.D. AND L.H.D

Second Exanxinat on, Part I., Anatomy and Physiology.-J. Po-Brown, J. B. Fisher, W. S. Hart, H. N. Ingham, H. V. Lamb.H. S. Raper, C. B. Richardson, B. A, Slocombe, G. V. Stockdale,N. S. Twist, and R. Ward.

DIPLOMA OF L.D.S.First Professional Examination.-H. R. Bentley, G. S. McKay, and

C. F. Salt.

UNIVERSITY OF DURHAM : FACULTY OF MEDI-CINE.-At the third examination held in March for the-

Degree of Bachelor in Medicine the following candidates.were successful :-Pathology, Medical Jurisprudence, Public Health, and Elementary,Bacteriology.-Jabez Ethelbert Dainty (second-class honours) ;Wilfred Barkes, John Akilade Caulerick. and Harold AlexanderCooper, College of Medicine, Newcastlo-upon-Tyne; HenryFrederick Itiewiez, London Hospital; Charles Marks, College ofMedicine, Newcastle-upon-Tyne; Theresa de Gournay Miller.London School of Medicine for Women; and Joseph Albert Sacco,William Sacco. Robert Henrv Smallwood, William Robert Elstob.Unthank, Charles Leslie Wigan, and George Hnntly Wood, Collegeof Medicine, Newcastle-upon-Tyne.

UNIVERSITY OF GLASGW.-The following havepassed the First Professional Examination for the degrees ofM.B. and Ch.B. in the subjects indicated (B., Botany Z., Zoology; P., Physics ; C., Chemistry) :-Mark James Aitken (B., P.), James Angus (B., P.), Robert RichmondArchibald, M.A. (B.), Charles Averill (Z ), Robert Brown Bain(P.), Alexander Baird (B.. Z.), Johannes Gerhardus Becker (Z., C.),Simon Harry Bloom (P.), Samuel Blumenfeld (Z., C.), Adam.Brown tZ., C.), Robert Archibald Brown (P.), William Brown(Z., C.), John Scouler Buchanan (Z.), Edmund Tytler Burke-(Z., 0.), Norman Cameron (B., 0.), John Campbell (P.), JohnMacDougall Clark (P., C.), George Cochrane (B.), Robert CorbettCorbett (Z.), Daniel Augustine Cush (B., Z ). George Dalziel(B., P.), Alexander Hugh Davidson (Z., P., C.), William TennentGairdner Davidson (Z., C.). James Henry Dible (Z" C.), WilliamBeatson Drummond (Z., C.), Joseph Dunbar (Z., C.), RobertFindlay (Z., C.), John Maitland Forsyth (C.), William Forsyth(Z., C.), William Fraser (Z.), John Erskine Fyfe (Z., C.), LeanderLowrie Fyfe (P.), John Joseph Gibb (B., P.), Alexander Muir-Gibson (Z., C.), Alexander Glen (Z., C.), Charles Hope Haddow(B., P.), John Reid Haldane (C.), James Stewart Hall (B., C.)James Hamilton (Z.), Daniel Christopher Hayes (B., Z., P.),Alexander Gibson Henderson (C.), Peter Henderson (B., Z.),John Galloway Hendry (B., Z., P.), John Wishart Welsh.Hewitt (Z., C.), Thomas Pollock Inglis (Z.), Andries Johannes-Joubert (Z., C.), Charles Joseph Kirk (C.), Robert Patrick Archi-bald Khkland (Z., C.), Johannes Arnoldus Kruger (C.), WilliamJoseph Brown Lavery (Z., C.), Frank Lawrie (Z.), Norman VeitchLothian (Z., C.), John Aloysius M’Connochie (Z., C.), John Fer-gusson M’Creath (Z., C.), James Ronald M’Curdie (Z., C.), Norman


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