| Budget Amount *help |
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2012: ¥12,610,000 (Direct Cost: ¥9,700,000、Indirect Cost: ¥2,910,000)
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| Outline of Final Research Achievements |
Electric-field-induced manipulations of interface magnetic anisotropy energy have been reported for the interfaces between ferromagnetic CoFeB nanometer-thick-layers and oxides. In this study we investigated the impacts of both constituent elements and their chemical states of CoFeB/oxide interfaces. The magnitude of response to the applied electric-field was found to be sensitive to the degree of CoFeB surface oxidations and maximized when the oxidation was limited and the oxygen atoms do not cover the whole surface. Since the reactivity with CoFeB depends on the employed oxide, the response to the applied electric-field was enhanced when we selected an oxide with less reactivity with CoFeB. In addition, we also found an emergence of non-volatile change of magnetic anisotropy energy only by electric-field application by employing TiOx as the oxide layer, which is attributable to the variable chemical states of Ti allowed in the oxide.
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