Presentation Information
[15p-PB1-12]Control of Spin Chirality in CoFe2O4/Fe Magnetic Bilayers and Thermal Transport Properties
〇(M2)SEBIN JUNG1, Hideto Yanagihara1 (1.Tsukuba Univ.)
Keywords:
non-collinear spin structure,spin chirality vecter,thermal transport
Recent research in condensed matter physics has actively explored phenomena arising from symmetry breaking, such as the Topological Hall Effect (THE) observed in skyrmions. However, realizing such non-trivial magnetic structures often relies on intrinsic parameters like the Dzyaloshinskii-Moriya interaction (DMI), which limits the conditions for their formation and hinders the flexible control of spin chirality. In this study, we investigate the relationship between broken spatial inversion symmetry and thermal transport properties by engineering a system where the spin chirality vector (χ) is controllable via interlayer exchange coupling (IEC).Multilayers of MgO(001)/CoFe2O4(30)/Fe(0-2)/Cr(cap)/SiO2/Pt were fabricated using radio-frequency magnetron sputtering. The existence of antiferromagnetic IEC between CoFe2O4 and Fe was confirmed through anomalous Hall effect measurements. By saturating the CoFe2O4 moment along its easy axis (out-of-plane) and applying an external magnetic field along the Fe hard axis (in-plane), we induced a non-collinear spin structure within the Fe layer through the competition between IEC and Zeeman energy. Upon applying a thermal gradient along the z-axis, we detected an electromotive force dependent on χ in the low-field region. This signal vanished at high magnetic fields where the spin twist was suppressed, suggesting that the observed phenomenon originates from the field-controlled non-collinear spin structure.