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首页> 外文期刊>Physical review >Direct measurements of the correlation between reentrant ferromagnetism and lattice expansion in FeCuZr alloys
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Direct measurements of the correlation between reentrant ferromagnetism and lattice expansion in FeCuZr alloys

机译：FeCuZr合金中折返铁磁性与晶格膨胀之间相关性的直接测量

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摘要

Amorphous metastable alloy of nominal composition (Fe_(0.5)Cu_(0.5)Zr_(13) has been synthesized by high-energy ball milling. The alloy exhibit a ferromagnetic behavior with a Curie Temperature of T_C=255 K, as determined from low-field measurements whereas no transition to a paramagnetic state is observed under high-enough applied magnetic fields. The evolution of hysteresis loops with temperature as well as thermorema-nence measurements indicate an anomalous magnetic behavior characterized by a spontaneous increase in the magnetization values as well as by a magnetic hardening when the temperature is increased above T_C. These effects are strongly correlated with a dilation of the Fe-Fe nearest-neighbor distances, as determined from extended x-ray absorption fine structure (EXAFS) studies. EXAFS results indicate an almost negligible thermal expansion at temperatures below T_C while normal thermal expansion takes place at higher temperatures. Such expansion seems to promote a reinforcement of the ferromagnetic interactions among Fe-Fe atoms that would account for the observed spontaneous increase in the magnetization as well as for the evolution of the coercive field.
机译：通过高能球磨合成了标称成分为（Fe_（0.5）Cu_（0.5）Zr_（13）的非晶亚稳态合金，该合金表现出铁磁性，居里温度为T_C = 255 K，由磁场测量，而在足够高的磁场下没有观察到转变为顺磁状态；磁滞回线随温度和热磁学测量的演变表明，磁行为异常，其磁化值和磁化强度自发增加。根据扩展的X射线吸收精细结构（EXAFS）研究确定，当温度升高到高于T_C时，磁性硬化会导致这些影响与Fe-Fe最近邻距离的扩展密切相关。在低于T_C的温度下热膨胀可忽略不计，而在较高温度下则发生正常的热膨胀，这种膨胀似乎可以增强Fe-Fe原子之间的铁磁相互作用，这将说明观察到的磁化强度的自发增加以及矫顽场的演变。

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  • 来源
    《Physical review》 |2010年第1期|P.012406.1-012406.4|共4页
  • 作者

    A. Martinez; J. Spottorno; A. I. Figueroa; F. Bartolome; L. M. Garcia; C. Prestipino; A. Hernando; P. Crespo;

  • 作者单位

    Institute de Magnetismo Aplicado, UCM-ADIF-CSIC, P.O. Box 155, 28230 Las Rozas (Madrid), Spain;

    Institute de Magnetismo Aplicado, UCM-ADIF-CSIC, P.O. Box 155, 28230 Las Rozas (Madrid), Spain;

    Instituto de Ciencia de Materiales de Aragon and Departamento de Fisica de la Materia Condensada, CSIC-Universidad de Zaragoza,Pedro Cerbuna 12, 50009 Zaragoza, Spain;

    Instituto de Ciencia de Materiales de Aragon and Departamento de Fisica de la Materia Condensada, CSIC-Universidad de Zaragoza,Pedro Cerbuna 12, 50009 Zaragoza, Spain;

    Instituto de Ciencia de Materiales de Aragon and Departamento de Fisica de la Materia Condensada, CSIC-Universidad de Zaragoza,Pedro Cerbuna 12, 50009 Zaragoza, Spain;

    European Synchrotron Radiation Facility, 6 rue Jules Horowitz-B.P. 220, F-38043 Grenoble, France;

    Institute de Magnetismo Aplicado, UCM-ADIF-CSIC, P.O. Box 155, 28230 Las Rozas (Madrid), Spain;

    Institute de Magnetismo Aplicado, UCM-ADIF-CSIC, P.O. Box 155, 28230 Las Rozas (Madrid), Spain;

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  • 正文语种 eng
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  • 关键词

    thermoelectric and thermomagnetic effects; magnetic properties;

    机译：热电和热磁效应;磁性能;

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