Observation of exchange bias in the martensitic state of Ni50Mn36Sn14 Heusler alloy
Observation of exchange bias in the martensitic state of Ni50Mn36Sn14 Heusler alloy
复制标题
Ni50Mn36Sn14 Heusler合金马氏体状态交换偏压的观察
DOI：
10.1063/1.2784958
复制
发表时间：
2007-09-10
影响因子：
4
通讯作者：
Zhang, Jincang
中科院分区：
文献类型：
--
作者：
Li, Zhe;Jing, Chao;Zhang, Jincang
通过磁滞回线的测量，在Ni50Mn36Sn14 Heusler合金中观察到场冷后的交换偏压。磁滞回线沿外加磁场的轴向沿着移动，并且在70 K以下，磁滞回线的幅度随温度的降低而显著增大。这种效应可以理解为马氏体相分离状态下反铁磁体和铁磁体界面处产生的交换各向异性的结果。然而，在70K以上，交换偏置场消失，并且由于反铁磁体和铁磁体之间的钉扎随着温度的升高而变弱，磁性显著降低。
Exchange bias was observed in the Ni50Mn36Sn14 Heusler alloy after field cooling by means of hysteresis loop measurement. The hysteresis loops shift along the axis of an applied field and its magnitude significantly increased with decreasing temperature below 70K. This effect could be understood as a result of exchange anisotropy created at the interface between an antiferromagnet and a ferromagnet in the phase separated of martensitic state. Above 70K, however, the exchange bias field disappeared and the coercivity significantly reduced owing to the fact that the pinning between an antiferromagnet and a ferromagnet becomes weaker with increasing temperature.