Magneto-Optical Analysis of Magnetic Anisotropy in Ultrathin Tm${}_3$Fe${}_5$O${}_{12}$/Pt Bilayers

Abstract

Magnetic bilayers consisting of an epitaxially grown ferrimagnetic insulator and a heavy metal layer are attractive for spintronic application because of the opportunity for electric control and read-out of spin textures via spin orbit torque. Here, we investigate ultrathin thulium iron garnet (TmIG)/Pt bilayers when the TmIG layer thickness is 3 nm and below using a sensitive Sagnac magneto-optical Kerr effect technique. We compare the hysteresis loops from out-of-plane and in-plane applied magnetic fields. The preferred magnetization orientation evolves with the TmIG thickness and the presence of the Pt overlayer. We quantify the evolution of the magnetic anisotropy in these ultrathin films and find a significant change even when the TmIG thickness is varied by less than 1 nm. In these ultrathin films, the presence of a Pt overlayer changes the effective anisotropy field by more than a factor of 2, suggesting that the interfacial anisotropy at the Pt/TmIG interface plays a critical role in this regime.

arXiv comment8 pages, 4 figures, 2 tables, submitted for review

References in corpus (22)

• Spontaneous Skyrmion Ground States in Magnetic Metals
• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
• Topological Hall effect in the A-phase of MnSi
• Skyrmions in Magnetic Multilayers
• The 2020 Skyrmionics Roadmap
• Antiferromagnonic Spin Transport from Y${}_3$Fe${}_5$O${}_{12}$ into NiO
• Electrical signature of individual magnetic skyrmions in multilayered systems
• High-speed domain wall racetracks in a magnetic insulator
• Topological Hall effect at above room temperature in heterostructures composed of a magnetic insulator and a heavy metal
• Enhanced Stability of Skyrmions in Two-Dimensional Chiral Magnets with Rashba Spin-Orbit Coupling
• Anomalous Hall hysteresis in Tm3Fe5O12/Pt with strain-induced perpendicular magnetic anisotropy
• Large Spin Pumping from Epitaxial Y3Fe5O12 Thin Films to Pt and W Layers
• Role of dimensional crossover on spin-orbit torque efficiency in magnetic insulator thin films
• Reciprocity in quantum, electromagnetic and other wave scattering
• Spin-Hall Topological Hall Effect in Highly Tunable Pt/Ferrimagnetic-Insulator Bilayers
• Constraints on Jones transmission matrices from time-reversal invariance and discrete spatial symmetries
• Colossal topological Hall effect at the transition between isolated and lattice-phase interfacial skyrmions
• Identifying the origin of the non-monotonic thickness dependence of spin-orbit torques and interfacial Dzyaloshinskii-Moriya interaction in a ferrimagnetic insulator heterostructure
• Current-Induced Magnetization Control in Insulating Ferrimagnetic Garnets
• Notes on Constraints for the Observation of Polar Kerr Effect in Complex Materials
• Polarizers, optical bridges and Sagnac interferometers for nanoradian polarization rotation measurements
• Ultrafast Optomagnonics in Ferrimagnetic Multi-Sublattice Garnets