Substrate induced magnetic anisotropies and magneto-optical response in YIG nanosized epitaxial films on NdGG(111)

B. B. Krichevtsov; V. E. Bursian; S. V. Gastev; A. M. Korovin; L. V. Lutsev; S. M. Suturin; K. V. Mashkov; M. P. Volkov; N. S. Sokolov

arXiv · 1901.10800

Substrate induced magnetic anisotropies and magneto-optical response in YIG nanosized epitaxial films on NdGG(111)

B. B. Krichevtsov·V. E. Bursian·S. V. Gastev·A. M. Korovin·L. V. Lutsev·S. M. Suturin·K. V. Mashkov·M. P. Volkov·N. S. Sokolov

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Abstract

Nanosized Y3Fe5O12 epitaxial films have been grown on Nd3Ga5O12 substrates using laser molecular beam epitaxy method. Magneto-optical polar Kerr effect, ferromagnetic resonance and spin wave propagation measurements show that the stress-related anisotropy field has an opposite sign, compared to that in the YIG/GGG systems. This leads to a considerable decrease of the effective magnetization that opens a perspective to get YIG films with perpendicular magnetization for utilizing forward volume spin waves. Longitudinal magnetooptical Kerr effect magnetometry reveals a large contribution of quadratic in magnetization terms into dielectric permittivity tensor at optical frequencies. This effect strongly increases with temperature decrease and is explained by magnetization of the interface Nd3+ ions that are exchange coupled to the Fe3+ ions.

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B. B. Krichevtsov, V. E. Bursian, S. V. Gastev, A. M. Korovin, L. V. Lutsev, S. M. Suturin, K. V. Mashkov, M. P. Volkov, N. S. Sokolov. 2018-12-12. Substrate induced magnetic anisotropies and magneto-optical response in YIG nanosized epitaxial films on NdGG(111). https://arxiv.org/abs/1901.10800

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