Research Update: Magnetoionic control of magnetization and anisotropy in layered oxide/metal heterostructures
Research Update: Magnetoionic control of magnetization and anisotropy in layered oxide/metal heterostructures
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DOI：
10.1063/1.4942636
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发表时间：
2016-02
期刊：
影响因子：
6.1
通讯作者：
K. Duschek;D. Pohl;S. Fähler;K. Nielsch;K. Leistner
中科院分区：
文献类型：
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作者：
K. Duschek;D. Pohl;S. Fähler;K. Nielsch;K. Leistner
具有垂直磁各向异性的层状结构中的磁化强度和各向异性的电场控制被期望增加自旋电子器件的多功能性。作为一个模型系统的可逆电压引起的磁离子效应的磁性变化，我们提出了几个氧化物/金属异质结在电解质中极化。在1 M KOH溶液中施加几伏电压，Fe-O/Fe层的室温磁化强度可改变64%。在下一步骤中，面内磁化Fe层的底部界面由表现出垂直磁各向异性的L10 FePt（001）底层功能化。在随后的电结晶和电氧化，定义明确的外延Fe 3 O 4/Fe/FePt异质结构演变。施加不同的电压导致夹在Fe-O和FePt之间的Fe层的厚度变化。在Fe/FePt双层膜的刚性磁体和交换弹簧磁体区域之间的过渡点处，这引起磁体的大的变化。
Electric field control of magnetization and anisotropy in layered structures with perpendicular magnetic anisotropy is expected to increase the versatility of spintronic devices. As a model system for reversible voltage induced changes of magnetism by magnetoionic effects, we present several oxide/metal heterostructures polarized in an electrolyte. Room temperature magnetization of Fe-O/Fe layers can be changed by 64% when applying only a few volts in 1M KOH. In a next step, the bottom interface of the in-plane magnetized Fe layer is functionalized by an L10 FePt(001) underlayer exhibiting perpendicular magnetic anisotropy. During subsequent electrocrystallization and electrooxidation, well defined epitaxial Fe3O4/Fe/FePt heterostructures evolve. The application of different voltages leads to a thickness change of the Fe layer sandwiched between Fe-O and FePt. At the point of transition between rigid magnet and exchange spring magnet regime for the Fe/FePt bilayer, this induces a large variation of magnet...