Strain-Tunable Magnetic Compensation Temperature of Epitaxial Tb${}_3$Fe${}_5$O${}_{12}$ Thin Films

Abstract

High-quality rare-earth iron garnet (ReIG) Tb${}_3$Fe${}_5$O${}_{12}$ (TbIG) thin films are epitaxially grown on a series of (111)-oriented garnet substrates with various lattice constants. The coherent growth induces a substrate-dependent in-plane tensile or compressive strain in the TbIG film. Measurements of the anomalous Hall-like effect (AHLE) in TbIG/Pt heterostructures show that the compensation temperature of TbIG films monotonically changes with the film strain. The strain results in a variation of the distances between magnetic atoms in the TbIG crystal and therefore the corresponding exchange interactions. The latter is explicitly calculated as a function of the lattice strain based on density functional theory, reproducing the observed experimental results. This work provides a versatile way to optimize ReIG-based spin-orbit torque devices.

28 pages, 5 figures

References in corpus (6)

• Anomalous Hall hysteresis in Tm3Fe5O12/Pt with strain-induced perpendicular magnetic anisotropy
• Long-distance spin transport in a disordered magnetic insulator
• First-Principles Study of Exchange Interactions of Yttrium Iron Garnet
• Systematic Control of Strain-Induced Perpendicular Magnetic Anisotropy in Epitaxial Europium and Terbium Iron Garnets Thin Films
• Magnon-phonon relaxation in yttrium iron garnet from first principles
• Sputtered terbium iron garnet films with perpendicular magnetic anisotropy for spintronic applications