Institut Néel, CNRS/Université Joseph Fourier, BP 166, F-38042 Grenoble, France.
J Phys Condens Matter. 2013 Oct 16;25(41):416007. doi: 10.1088/0953-8984/25/41/416007. Epub 2013 Sep 24.
Intrinsic magnetic properties and magnetovolume effects have been investigated for the Hf0.825Ta0.175Fe2 itinerant-electron system, which exhibits a temperature-induced first-order transition from the ferromagnetic (FM) to the antiferromagnetic (AFM) state. The spontaneous volume magnetostriction contraction due to this transition from the high-volume FM state to the low-volume AFM state is about 0.66%. Applying a magnetic field increases significantly the FM-AFM transition temperature T(FM-AFM), with a rate of 7.2 K T(-1). At temperatures T > T(FM-AFM) a first-order metamagnetic transition between the AFM and FM states has been observed from isothermal magnetization curves, a result attributed to the itinerant-electron character of the Fe magnetism. This AFM-FM transition is accompanied by a huge field-induced volume magnetostriction. The change in ΔV/V due to the AFM-FM transition is about 0.75%.
对具有巡游电子特性的 Hf0.825Ta0.175Fe2 体系进行了本征磁性和磁体积效应的研究，该体系表现出由铁磁 (FM) 相到反铁磁 (AFM) 相的温度诱导一级相变。由于从高体积 FM 相到低体积 AFM 相的转变，自发体积磁致伸缩收缩约为 0.66%。施加磁场显著提高了 FM-AFM 相变温度 T(FM-AFM)，其速率为 7.2 K T(-1)。在温度 T > T(FM-AFM)时，从等温磁化曲线观察到 AFM 和 FM 态之间的一级类超交换转变，这归因于 Fe 磁体的巡游电子特性。这种 AFM-FM 转变伴随着巨大的场致体积磁致伸缩。由于 AFM-FM 转变，ΔV/V 的变化约为 0.75%。
