Magnetic anisotropy of nonmodulated Ni-Mn-Ga martensite revisited

0348714 - FZÚ 2011 RIV US eng J - Journal Article
Heczko, Oleg - Straka, L. - Novák, Václav - Fähler, S.
Magnetic anisotropy of nonmodulated Ni-Mn-Ga martensite revisited.
Journal of Applied Physics. Roč. 107, č. 9 (2010), 09A914/1-09A914/3. ISSN 0021-8979. E-ISSN 1089-7550
Grant - others:AV ČR(CZ) M100100913
Institutional research plan: CEZ:AV0Z10100520
Keywords : magnetic anisotropy of non-modulated martensite * temperature dependence of anisotropy * Ni-Mn-Ga * adaptive martensite
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.064, year: 2010
http://jap.aip.org/resource/1/japiau/v107/i9/p09A914_s1

Magnetic anisotropy of single crystal Ni50.5Mn30.4Ga19.1 having nonmodulated (NM) martensite structure (c=0.660 nm and b=a=0.547 nm at room temperature) was determined in the range of 10-300 K. The single variant microstructure needed for proper anisotropy determination was prepared by 40 MPa tensile stress in comparison with previous measurements where detwinned microstructure was obtained by compression. The tensile stress process yield the single variant microstructure with easy plane magnetic anisotropy and negligible second anisotropy constant in contrast of two anisotropy constants of the same order for compressed sample. The absolute value of anisotropy constant increases from 2.6x10⁵ J/m³ at 300 K to 5x10⁵ J/m³ at 10K.
Permanent Link: http://hdl.handle.net/11104/0189156