Structure and exchange bias of Ni50Mn37Sn13 ribbons
Structure and exchange bias of Ni50Mn37Sn13 ribbons
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DOI：
10.1063/1.3672244
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发表时间：
2012-02
影响因子：
3.2
通讯作者：
Y. B. Yang;X. Ma;X. G. Chen;Jun Wei;R. Wu;Jingzhi Han;H. Du;Changsheng Wang;Sheng-gen Liu;Yuchao Yang;Y. Zhang;J. Yang
中科院分区：
文献类型：
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作者：
Y. B. Yang;X. Ma;X. G. Chen;Jun Wei;R. Wu;Jingzhi Han;H. Du;Changsheng Wang;Sheng-gen Liu;Yuchao Yang;Y. Zhang;J. Yang
采用熔融纺丝法制备了Ni50Mn37Sn13带。对Ni50Mn37Sn13条带的结构和磁性测量表明，该条带在340 K以下为铁磁性，在室温以下发生奥氏体向马氏体相变。奥氏体相具有立方L21结构，过量的锰原子占据4(b)位。马氏体相具有正交结构。随着外加磁场的增大，由于场致相变，马氏体的起始温度Ms和结束温度Mf向较低的温度移动。在低温条件下，交换偏置效应随冷却场的不同而有明显的变化。在5 K时，当冷却场增加到200 Oe时，交换偏置场达到290 Oe的最大值，然后随着冷却场的进一步增加，由于反铁磁和铁磁界面之间的交换耦合减弱，交换偏置场缓慢减小。
Ni50Mn37Sn13 ribbons were produced by the melt-spinning method. Structure and magnetic measurements on the Ni50Mn37Sn13 ribbons indicated that it is ferromagnetic below 340 K and undergoes an austenitic-to-martensitic phase transition just below room temperature. The austenitic phase has the cubic L21 structure, with the excess manganese atoms occupying the 4(b) sites. The martensitic phase has an orthorhombic structure. With increasing applied magnetic field, the martensite start temperature Ms and martensite finish temperature Mf shift to lower temperatures because of the field-induced phase transition. The exchange-bias effect is observed and strongly varied with different cooling fields at low temperature. At 5 K, the exchange-bias field reaches a maximum of 290 Oe when the cooling field increases to 200 Oe, and then reduces sluggishly with further increase of the cooling field because of weakening of exchange coupling between antiferromagnetic and ferromagnetic interfaces.