A computer controlled spin echo spectrometer for the study of ferromagnetic materials

Dumelow, T.; Riedi, P. C.

doi:10.1007/bf02394550

Cited by 56 publications

(8 citation statements)

References 3 publications

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“…8 The spectra were recorded by integrating the spin echo at each frequency as described previously. 9 The low Q of the untuned sample holder meant that there was not sufficient rf power available to excite a spin echo from the 55 Mn nuclei in the AFM phase. The phase boundary at T t3 was taken as the temperature and pressure at which the 55 Mn signal vanished.…”

Section: Methodsmentioning

confidence: 99%

NMR study of the ferromagnetic phases ofSmMn2Ge2as a function o

et al. 1996

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NMR study of the ferromagnetic phases of SmMn2Ge2 as a function of temperature and pressure Lord, J.S.; Riedi, P.C.; Tomka, G.J.; Kapusta, Cz.; Buschow, K.H.J. Link to publication Citation for published version (APA):Lord, J. S., Riedi, P. C., Tomka, G. J., Kapusta, C., & Buschow, K. H. J. (1996). NMR study of the ferromagnetic phases of SmMn2Ge2 as a function of temperature and pressure. Physical Review. B, Condensed Matter, 53(1), 283-288. DOI: 10.1103/PhysRevB.53.283 General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. The behavior of the reentrant ferromagnet SmMn 2 Ge 2 has been studied as a function of temperature and pressure using NMR in zero applied field. At atmospheric pressure SmMn 2 Ge 2 is ferromagnetic ͑FM͒ from T t1 Ϸ348 K to T t2 Ϸ196 K, then antiferromagnetic ͑AFM͒ to T t3 Ϸ100 K. The material is again ferromagnetic below T t3 . The behavior of T t3 as a function of pressure has been studied using 55 Mn NMR. The value of dT t3 /dP at low pressure is found to be about Ϫ16 K kbar Ϫ1 , in agreement with earlier work but its magnitude decreases at higher pressure. The value of T t3 at 7.8 kbar is 47 K. The 55 Mn NMR frequency increases with increasing temperature in the range 3-75 K, despite the decrease in magnetization by some 16%. The decrease in magnetization is attributed to the collapse of the ordered Sm state near 75 K. The 147 Sm and 149 Sm NMR could, however, only be observed up to 19 K, because of the rapid increase of the transverse relaxation rate with temperature, so we do not have conclusive evidence that the Sm moment has no influence on the AFM-FM transition at T t3 . A remarkable feature of the Sm NMR is that its frequency at a given temperature is independent of pressure whereas the Mn NMR frequency decreases with increasing pressure.

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Section: Methodsmentioning

confidence: 99%

NMR study of the ferromagnetic phases ofSmMn2Ge2as a function o

et al. 1996

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“…The *'Y NMR spectra of the Y-Fe compounds were measured at 4.2 Kusing an automated spin-echo spectrometer (Dumelow and Riedi 1987a). The 57Fe NMR has already been reported for YFe, (Dumelow et a1 1986).…”

Section: Hyperfine Fieldsmentioning

confidence: 99%

The magnetic moment at the yttrium site in Y-Fe compounds: pressure dependence of the magnetisation and hyperfine field

Armitage

Dumelow

Riedi

et al. 1989

J. Phys.: Condens. Matter

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The pressure dependence of the magnetisation of Y2Fe17, Y6Fe23 and YFe2 at 4.2 K has been deduced from forced volume magnetostriction measurements in fields up to 12 T. The pressure dependence of the 89Y hyperfine field in the above compounds and YFe3 has been measured using NMR. The results are consistent with a model in which a moment of approximately=-0.4 mu B exists at the Y site of all four compounds as found in computer calculations for YFe2.

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“…All NMR measurements were taken on a computer controlled spin-echo spectrometer [5]. GdAlz readings were made on a single crystal and HoA12 readings on a powdered polycrystalline sample.…”

Section: Methodsmentioning

confidence: 99%