arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.01226cond-mat.mtrl-sci
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MnCo1-xFexSi合金的结构和磁性

Structural and magnetic properties of MnCo1-xFexSi alloys

J. H. Chen, Z. Y. Wei, E. K. Liu, X. Qi, W. H. Wang, G. H. Wu

摘要:

采用差示扫描量热仪(DSC)、X射线粉末衍射仪(XRD)和磁测量等方法研究了MnCo_(1-x)Fe_xSi(0 <= x <= 0.50)合金的晶体结构、马氏体相变和磁性能。在高温顺磁状态下,合金发生了由六方相的Ni 2 In型马氏体向TiNiSi型正交马氏体的转变。随Fe含量的增加,马氏体转变温度(TM)和马氏体居里温度(T_C^M)均降低。引入的Fe原子在Fe-Mn原子之间建立铁磁(FM)耦合,并破坏MnCoSi化合物中的双螺旋反铁磁(AFM)耦合,导致马氏体相的磁性从螺旋AFM状态转变为FM状态。对于x = 0.10,0.15和0.20的合金,在两种磁性状态之间观察到了变磁转变。提出了MnCo_(1-x)FexSi(0 <= x <= 0.50)合金的磁结构相图。

英文摘要:

The crystal structures, martensitic structural transitions and magnetic properties of MnCo1-xFexSi (0 <= x <= 0.50) alloys were studied by differential scanning calorimetry (DSC), x-ray powder diffraction (XRD) and magnetic measurements. In high-temperature paramagnetic state, the alloys undergo a martensitic structural transitions from the Ni2In-type hexagonal parent phase to the TiNiSi-type orthorhombic martensite. Both the martensitic transition temperature (TM) and Curie temperatures of martensite (T_C^M) decrease with increasing Fe content. The introduced Fe atoms establish ferromagnetic (FM) coupling between Fe-Mn atoms and destroy the double spiral antiferromagnetic (AFM) coupling in MnCoSi compound, resulting in a magnetic change in the martensite phase from a spiral AFM state to a FM state. For the alloys with x = 0.10, 0.15 and 0.20, a metamagnetic transition was observed in between the two magnetic states. A magnetostructural phase diagram of MnCo1-xFexSi (0 <= x <= 0.50) alloys was proposed.

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