磁性
铁磁性
材料科学
自旋电子学
凝聚态物理
居里温度
磁化
物理
磁场
量子力学
作者
Zhaohui Li,Hengjun Liu,Zhiqiang Zhao,Qinghua Zhang,Xingke Fu,Xiangkun Li,Fangchao Gu,Hai Zhong,Yuanyuan Pan,Guihuan Chen,Qinghao Li,Hongsen Li,Yanxue Chen,Lin Gu,Kuijuan Jin,Shishen Yan,Guo‐Xing Miao,Ge Chen,Qiang Li
标识
DOI:10.1002/adma.202207353
摘要
Ferromagnetic metals show great prospects in ultralow-power-consumption spintronic devices, due to their high Curie temperature and robust magnetization. However, there is still a lack of reliable solutions for giant and reversible voltage control of magnetism in ferromagnetic metal films. Here, a novel space-charge approach is proposed which allows for achieving a modulation of 30.3 emu/g under 1.3 V in Co/TiO2 multilayer granular films. The robust endurance with more than 5000 cycles is demonstrated. Similar phenomena exist in Ni/TiO2 and Fe/TiO2 multilayer granular films, which shows its universality. The magnetic change of 107% in Ni/TiO2 underlines its potential in a voltage-driven ON-OFF magnetism. Such giant and reversible voltage control of magnetism can be ascribed to space-charge effect at the ferromagnetic metals/TiO2 interfaces, in which spin-polarized electrons are injected into the ferromagnetic metal layer with the adsorption of lithium-ions on the TiO2 surface. These results open the door for a promising method to modulate the magnetization in ferromagnetic metals, paving the way toward the development of ionic-magnetic-electric coupled applications.
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