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Titolo:
Ferromagnetic resonance in non-stoichiometric Ni1-x-yMnxGay
Autore:
Shanina, BD; Konchits, AA; Kolesnik, SP; Gavriljuk, VG; Glavatskij, IN; Glavatska, NI; Soderberg, O; Lindroos, VK; Foct, J;
Indirizzi:
Kiev Met Phys Inst, Dept Steels & Alloys, UA-252142 Kiev 03142, Ukraine Kiev Met Phys Inst Kiev Ukraine 03142 oys, UA-252142 Kiev 03142, Ukraine Inst Semicond Phys, Dept Opt & Spect, UA-03028 Kiev, Ukraine Inst SemicondPhys Kiev Ukraine UA-03028 & Spect, UA-03028 Kiev, Ukraine Helsinki Univ Technol, Lab Phys Met & Mat Sci, FIN-02015 Espoo, Finland Helsinki Univ Technol Espoo Finland FIN-02015 , FIN-02015 Espoo, Finland CNRS, UMR 8517, Lab Met Phys & Genie Mat, F-59655 Villeneuve Dascq, FranceCNRS Villeneuve Dascq France F-59655 t, F-59655 Villeneuve Dascq, France
Titolo Testata:
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
fascicolo: 3, volume: 237, anno: 2001,
pagine: 309 - 326
SICI:
0304-8853(200112)237:3<309:FRINN>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
SHAPE-MEMORY ALLOYS; STRESS-INDUCED MARTENSITES; NI2MNGA SINGLE-CRYSTALS; X-RAY-DIFFRACTION; MN-GA ALLOYS; HEUSLER ALLOYS; PHASE-TRANSFORMATIONS; MAGNETIC-PROPERTIES; FIELD; TEMPERATURE;
Keywords:
Ni2MnGa; magnetic shape memory effect; ferromagnetic resonance; magnetic anisotropy; free electrons;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Gavriljuk, VG Kiev Met Phys Inst, Dept Steels & Alloys, Vernadsky Blvd 36,UA-252142 Kiev 03142, Ukraine Kiev Met Phys Inst Vernadsky Blvd 36 Kiev Ukraine 03142 ine
Citazione:
B.D. Shanina et al., "Ferromagnetic resonance in non-stoichiometric Ni1-x-yMnxGay", J MAGN MAGN, 237(3), 2001, pp. 309-326

Abstract

Non-stoichiometric alloys Ni1-x-yMnxGay. characterised by different valuesof MSME (from 0.2% to 7.3%) were studied using ferromagnetic resonance (FMR). The angular dependence of the FMR signals was measured in the martensitic and austenitic states of the samples just before and after martensite-austenite transition. Experimental data were used for the determination of the magnetisation 4 piM(s) and anisotropy parameters K-1, K-2 for the martensitic state and K-1c for the austenitic state. All studied alloys were characterised by large values of the anisotropy parameters of the first and second orders. A special feature of the alloys possessing high MSME is a largervalue of the coefficient K-2. The temperature dependence of the FMR signals was investigated in the temperature range from below M-s to above T-C, where FMR was replaced by conduction electron spin resonance (CESR). Magnetically induced strain in the martensitic phase was measured as a function of the applied magnetic field. The main difference between the alloys in the martensitic state revealing the large or small MSM strain is the behaviour of the electronic structure. In the alloys with the small MSM strain, all the electrons are involved in the ferromagnetic system. On the contrary, in the alloy with the large MSM strain, the narrow resonance line of one electron subsystem is present separately in the FMR spectra. An intensive signal of CESR is observed in the alloys with the large MSME, which is an evidencefor a high concentration of free electrons. The suggestion made is that the high concentration of free electrons, i.e. enhanced metallic character ofinteratomic bonds, assists MSME. (C) 2001 Elsevier Science B.V. All rightsreserved.

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Documento generato il 30/09/20 alle ore 23:39:15