Open AccessMagnetic field-induced martensitic transformation, superspin glass and exchange bias in Heusler alloys NiCoMnSn
Author(s) -
Hongwu Zhang,
Weina Zhou,
Enke Liu,
Wenhong Wang,
Guangheng Wu
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.147501
Subject(s) - materials science , condensed matter physics , ferromagnetism , exchange bias , martensite , diffusionless transformation , saturation (graph theory) , spin glass , phase (matter) , magnetic field , magnetization , metallurgy , microstructure , magnetic anisotropy , physics , mathematics , quantum mechanics , combinatorics
The crystal structures and magnetic properties of Ni50-xCoxMn39Sn11 (8≤x≤10) Heusler alloys are investigated. As a result, we achieve the magnetic field induced martensitic transformation in Ni42Co8Mn39Sn11. It is found that the saturation magnetic moments of alloys increase with Co content increasing. Moreover, a superspin glass behavior and a large exchange bias effect are also found in samples with Co content being higher than 8. We confirm the coexistence of superspin glass of the martensite and ferromagnetic parent phase, which is the physical origin of the exchange bias effect. On the other hand, we propose that the origin of superspin glass in our NiMnCoSn system is due to the occurence of Mn-Mn cluster as reported by Ma et al. in Heusler Mn2Ni1.6Sn0.4 alloys [Ma L, Wang W H, Liu J B, Li J Q, Zhen M, Hou D L and Wu G H 2011 Appl. Phys. Lett. 99 182507].