Detection of induced paramagnetic moments in Pt on Y${}_3$Fe${}_5$O${}_{12}$ via x-ray magnetic circular dichroism

Abstract

Magnetic moments in an ultra-thin Pt film on a ferrimagnetic insulator Y${}_3$Fe${}_5$O${}_{12}$ (YIG) have been investigated at high magnetic fields and low temperatures by means of X-ray magnetic circular dichroism (XMCD). We observed an XMCD signal due to the magnetic moments in a Pt film at the Pt $L_3$- and $L_2$-edges. By means of the element-specific magnetometry, we found that the XMCD signal at the Pt $L_3$-edge gradually increases with increasing the magnetic field even when the field is much greater than the saturation field of YIG. Importantly, the observed XMCD intensity was found to be much greater than the intensity expected from the Pauli paramagnetism of Pt when the Pt film is attached to YIG. These results imply the emergence of induced paramagnetic moments in Pt on YIG and explain the characteristics of the unconventional Hall effect in Pt/YIG systems.

arXiv comment8 pages, 5 figures

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• Spin-orbit torque and spin pumping in YIG/Pt with interfacial insertion layers
• Magnon polarons in the spin Peltier effect
• Composition-tunable magnon-polaron anomalies in spin Seebeck effects in epitaxial Bi${}_x$Y${}_{3-x}$Fe${}_5$O${}_{12}$ films
• Static magnetic proximity effects and spin Hall magnetoresistance in Pt/Y${}_3$Fe${}_5$O${}_{12}$ and inverted Y${}_3$Fe${}_5$O${}_{12}$/Pt bilayers
• Anomalous spin Hall angle of a metallic ferromagnet determined by a multiterminal spin injection/detection device
• Appearance of ferromagnetism in Pt(100) ultrathin films originated from quantum-well states
• Cryogenic spin Peltier effect detected by a RuO${}_2$-AlO${}_x$ on-chip microthermometer