Enhanced magnetic hysteresis in Ni-Mn-Ga single crystal and its influence on magneticshape memory effect

0454555 - FZÚ 2016 RIV US eng J - Článek v odborném periodiku
Heczko, Oleg - Drahokoupil, Jan - Straka, L.
Enhanced magnetic hysteresis in Ni-Mn-Ga single crystal and its influence on magneticshape memory effect.
Journal of Applied Physics. Roč. 117, č. 17 (2015), "17E703-1"-"17E703-4". ISSN 0021-8979. E-ISSN 1089-7550
Grant CEP: GA ČR(CZ) GAP107/11/0391
Institucionální podpora: RVO:68378271
Klíčová slova: field-induced strain * temperature-dependence * alloy * martensite * Ni₂MnGa * anisotropy
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 2.101, rok: 2015

Enhanced magnetic hysteresis due to boron doping in combination with magnetic shape memory effect in Ni-Mn-Ga single crystal results in new interesting functionality of magnetic shape memory (MSM) alloys such as mechanical demagnetization. In Ni50.0Mn28.5Ga21.5 single crystal, the boron doping increased magnetic coercivity from few Oe to 270 Oe while not affecting the transformation behavior and 10 M martensite structure. However, the magnetic field needed for MSM effect also increased in doped sample. The magnetic behavior is compared to undoped single crystal of similar composition. The evidence from the X-ray diffraction, magnetic domain structure, magnetization loops, and temperature evolution of the magnetic coercivity points out that the enhanced hysteresis is caused by stress-induced anisotropy.

Trvalý link: http://hdl.handle.net/11104/0255218