Details

Autor(en) / Beteiligte

• Qian, J. F.
• Liu, E. K.
• Feng, L.
• Zhu, W.
• Li, G. J.
• Wang, W. H.
• Wu, G. H.
• Du, Z. W.
• Fu, X.

Titel

Unusual magnetic anisotropy in the ferromagnetic shape-memory alloy Ni50Fe23Ga27

Ist Teil von

• Applied physics letters, 2011-12, Vol.99 (25)

Erscheinungsjahr

2011

Quelle

AIP Journals Complete

Beschreibungen/Notizen

• Unusual magnetic anisotropy of the ferromagnetic shape-memory alloy Ni50Fe23Ga27 has been observed. The anisotropy of the austenite becomes very large, even larger than that of the martensite in ribbon samples. Lowering the temperature from 300 K to 80 K, the saturation field of the austenite is dramatically increased from 200 Oe up to 6 kOe. This high-anisotropy behavior clearly highlights the demagnetization effect of the martensitic transformation. The physical mechanism is attributed to a collective effect coming from the atomic disorder, the premartensitic transformation, and the off-stoichiometric Ga-rich composition of the alloys.