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Electrically controllable magnetism, which requires the field-effectmanipulation of both charge and spin degrees of freedom, has attracted growinginterests since the emergence of spintronics. In this work, we report thereversible 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 magneticmoments, which induces itinerant ferromagnetism on the surface of Pt films withlarge coercivity and perpendicular anisotropy mimicking the idealtwo-dimensional Ising-type FM state. The electrical transport of the induced FMstate shows Kondo effect at low temperature suggesting spatially separatedcoexistence of Kondo scattering beneath the FM interface. The tunable FM stateindicates that paramagnetic ionic gating could serve as a versatile method toinduce rich transport phenomena combining field effect and magnetism atPIL-gated interfaces.

Inducing ferromagnetism and Kondo effect in platinum by paramagnetic ionic gating