Electrically Controlled Magnetoresistance in Ion-Gated Platinum Thin Films

Spin Current Transport in Hybrid Pt/Multifunctional Magnetoelectric Ga0.6Fe1.4O3 Bilayers

“…The inversion temperature is of about 120 K, which is the same as the one at which the longitudinal resistivity ρ xx goes to zero (Figure b). A sign inversion of the transverse resistivity has already been observed for Pt/YIG systems and assigned to AHE induced by MPE in Pt. ,, Similar temperature variations of the AHE were also observed in the absence of any FM layer in ion-gated platinum thin films and analogously attributed to some induced FM ordering on the Pt surface. , The explanation given by Zhou et al for such a sign inversion is that for paramagnetic Pt, both the density of states (DOS) and curvature near the Fermi surface importantly change with temperature. They indeed observed, for Pt/YIG heterostructures, a sign inversion of the ordinary Hall coefficient R 0 of Pt with temperature, indicating a change of the carrier type.…”

“…15,19,53 Similar temperature variations of the AHE were also observed in the absence of any FM layer in ion-gated platinum thin films and analogously attributed to some induced FM ordering on the Pt surface. 16,54 The explanation given by Zhou et al 53 for such a sign inversion is that for paramagnetic Pt, both the density of states (DOS) and curvature near the Fermi surface importantly change with temperature. They indeed observed, for Pt/YIG heterostructures, a sign inversion of the ordinary Hall coefficient R 0 of Pt with temperature, indicating a change of the carrier type.…”

“…15,19,53 Similar temperature variations of the AHE were also observed in the absence of any FM layer, in ion-gated platinum thin films and analogously attributed to some induced ferromagnetic ordering on the Pt surface. 16,54 The explanation given by Zhou et al 53 Pt, R0, determined as the slope of the linear part of the measurements at high magnetic fields, is always negative and does not vary significantly with temperature. It allows determining a free electron density in Pt of 48 .10 28 /m 3 , in good agreement with values expected for a metal 55 and already reported for other Pt thin films.…”