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首页> 外文期刊>Physical review >Electric-field-induced magnetization changes in Co/Al_2O_3 granular multilayers
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Electric-field-induced magnetization changes in Co/Al_2O_3 granular multilayers

机译：Co / Al_2O_3颗粒状多层膜中电场感应的磁化强度变化

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摘要

We study experimentally the effect of electric field on the magnetization of Co/Al_2O_3 granular multilayers. We observe two distinct regimes: (a) low-field regime when the net magnetization of the system changes in a reversible way with the applied electric field and (b) high-field regime when the magnetization decreases irreversibly. The former is attributed to the changes in the relative 3d-orbital occupation of the minority and majority bands in the Co granules. A theoretical model has been developed to explain the electric-field-induced changes in the band structure of the granular system and hence the magnetic moment. The latter result may be understood assuming the electric field induces oxygen migration from Al_2O_3 to the Co granules, since an increase in oxidation state of the Co granules is shown, through ab initio calculations, to give rise to a reduced magnetization of the system.
机译：我们通过实验研究了电场对Co / Al_2O_3颗粒状多层膜磁化的影响。我们观察到两种不同的状态：（a）当系统的净磁化强度随施加的电场以可逆方式变化时的低场状态，以及（b）当磁化强度不可逆地减小时的高磁场状态。前者归因于Co颗粒中少数和多数带的相对3d轨道职业的变化。已经建立了理论模型来解释电场引起的颗粒系统能带结构的变化，从而解释了磁矩。假定电场诱导氧从Al_2O_3迁移到Co颗粒中，则可以理解后一个结果，因为通过从头算起显示出Co颗粒的氧化态增加，从而导致系统磁化强度降低。

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  • 来源
    《Physical review》 |2013年第1期|014425.1-014425.5|共5页
  • 作者

    Ajeesh M. Sahadevan; Alan Kalitsov; Gopinadhan Kalon; Charanjit S. Bhatia; Julian Velev; Hyunsoo Yang;

  • 作者单位

    Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore;

    Department of Physics, University of Puerto Rico, San Juan, Puerto Rico 00931, USA;

    Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore;

    Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore;

    Department of Physics, University of Puerto Rico, San Juan, Puerto Rico 00931, USA;

    Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore;

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  • 正文语种 eng
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  • 关键词

    magnetization curves, hysteresis, barkhausen and related effects;

    机译：磁化曲线;磁滞;巴克豪森及其相关效应;

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