Abstract

We report the structural disorder effect on magnetic and electric transport properties of \(\hbox {Ni}_{50}\hbox {Mn}_{35}\hbox {In}_{15}\) Heusler alloy (HA) films. Two sets of samples were investigated: disordered (partially amorphous) and ordered (crystalline with \(\hbox {L2}_{1}\) structure) samples. Electric transport measurements vs. temperature shows that the process of structural ordering is accomplished with a two-stage drop in resistivity at 570 and 630 K which are ascribed to crystallization and \(\hbox {L2}_{1}\)-type structural ordering, respectively. Ordered films show a metallic and magnetization behavior typical for \(\hbox {Ni}_{50}\hbox {Mn}_{35}\hbox {In}_{15}\) HA. By contrast, disordered films show ten times lower saturation magnetization with comparable effective magnetization determined from ferromagnetic resonance. We explain this difference as the unusual effect of the inhomogeneous microstructure of the disordered films consisting of Ni clusters embedded in a nonmagnetic matrix.

Graphic abstract

中文翻译：

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Ni–Mn–In Heusler合金薄膜的磁性和输运性质：结构无序的影响

摘要

我们报告了结构紊乱对\（\ hbox {Ni} _ {50} \ hbox {Mn} _ {35} \ hbox {In} _ {15} \） Heusler合金（HA）薄膜的电磁和电输运性能的影响。研究了两组样品：无序（部分无定形）和有序（具有\（\ hbox {L2} _ {1} \）结构的晶体）样品。相对于温度的电迁移率测量结果表明，结构的有序化过程是通过在570和630 K下电阻率分两阶段下降来实现的，这两个阶段的电阻率均归因于结晶和\（\ hbox {L2} _ {1} \）型结构分别订购。有序薄膜显示出典型的\（\ hbox {Ni} _ {50} \ hbox {Mn} _ {35} \ hbox {In} _ {15} \）的金属和磁化行为哈。相比之下，无序薄膜的饱和磁化强度要低十倍，而有效磁化强度是由铁磁共振确定的。我们将这种差异解释为由嵌入非磁性基质中的Ni簇组成的无序薄膜的不均匀微观结构的不寻常影响。

图形摘要