Electrically controllable magnetism, which requires the field-effect manipulation of both charge and spin degrees of freedom, has attracted growing interest since the emergence of spintronics. We report the reversible electrical switching of ferromagnetic (FM) states in platinum (Pt) thin films by introducing paramagnetic ionic liquid (PIL) as the gating media. The paramagnetic ionic gating controls the movement of ions with magnetic moments, which induces itinerant ferromagnetism on the surface of Pt films, with large coercivity and perpendicular anisotropy mimicking the ideal two-dimensional Ising-type FM state. The electrical transport of the induced FM state shows Kondo effect at low temperature, suggesting spatially separated coexistence of Kondo scattering beneath the FM interface. The tunable FM state indicates that paramagnetic ionic gating could serve as a versatile method to induce rich transport phenomena combining field effect and magnetism at PIL-gated interfaces.

中文翻译：

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通过顺磁性离子门控在铂中感应铁磁性和近藤效应。

自旋电子学的出现，就要求对电荷和自旋自由度都进行场效应控制的电控磁性吸引了越来越多的兴趣。我们通过引入顺磁性离子液体（PIL）作为门控介质来报告铂（Pt）薄膜中铁磁（FM）状态的可逆电转换。顺磁性离子门控以磁矩控制离子的运动，从而在Pt膜的表面上引发流动性铁磁性，具有大的矫顽力和垂直各向异性，模仿了理想的二维Ising型FM态。诱导的FM状态的电输运在低温下显示近藤效应，表明FM界面下方近藤散射在空间上分离存在。