Spin Hall magnetoresistance of CoFe2O4/Pt heterostructures with interface non-collinear magnetic configurations

Abstract

We have investigated the spin Hall magnetoresistance (SMR) in CoFe2O4/Pt heterostructures deposited on (001) MgO and (001) MgAl2O4 substrates, respectively. It is found that the interface non-collinear magnetic configurations should exist in both of the two films in the whole temperature range from 5 to 300 K but mainly dominate the spin transport properties at low temperature. Furthermore, the spin transport has featured epitaxial-strain-modified characteristics induced by different substrates, which has been investigated by magnetic curves, SMR, anisotropic magnetoresistance, and Hall effect measurements.

Angular-dependent magnetoresistance modulated by interfacial magnetic state in Pt/LSMO heterostructures

“…As the temperature increases, the thermal disturbance further enhances the spin disorder, 32 contributing to the increased positive FDMR. This is consistent with the previous report that the non-collinear spin textures can be induced by the strong SOC and interfacial DMI in various heavy metal/oxide heterostructures, such as the Pt/α-Fe 2 O 3 , 12 Pt/CoFe 2 O 4 , 16 Pt/Y 3 Fe 5 O 12 , 33 and perovskite oxides La 0.3 Sr 0.7 MnO 3 /SrIrO 3 34 and SrRuO 3 /SrIrO 3 35,36 heterostructures, SrRuO 3 /SrIrO 3 superlattices. 37 In addition to the enhanced electron scattering induced by the spin disorder, the weak antilocalization (WAL) effect can also cause positive MR in LSMO.…”

“…14 The surface of AFM oxides consistently exhibits distinct properties from the bulk due to the uncompensated surface spin, magnetic anisotropy, and the interplay of magnetic interactions. [15][16][17] The magnetoresistance (MR) studies on heavy metal/AFM insulating oxide heterostructures have primarily focused on the SMR. [5][6][7][8][9][10][11][12] In SMR, the current flows through the heavy metal, and no MR signal originates from the magnetic layer.…”

Enhanced spin current transmissivity in Pt/ CoFe2O4 bilayers with thermally induced interfacial magnetic modification

“…5(e). This behavior opens a new scenario on surface magnetization that can be ascribed to noncollinear magnetic domains or a spin-flop transition at the ferrimagnet surface [23,[48][49][50].…”

“…Generally, most studies with SMR have focused on FMI/NM heterostructures with collinear magnetic configurations. It is quite interesting that only a few SMR investigations have explored the noncollinear and/or canted magnetic configurations of the FMI magnetization layer [22][23][24][25][26], given that they offer an excellent playground for the scrutiny of interactions between surface magnetic ordering and spin transport phenomena. In the last several years, spinel insulating oxides, such as cobalt ferrite (CoFe 2 O 4 ; CFO) [27][28][29][30][31][32], have shown up as promising candidates for spin current injectors, since they own predicates that allow the analysis of the influence of the surface magnetic configuration on the spin transport in FMI/NM heterostructures.…”