Missing Magnetism in Sr₄Ru₃O₁₀: Indication for Antisymmetric Exchange Interaction

Date

2018-09-24

Authors

Weickert, Franziska
Civale, Leonardo
Maiorov, Boris
Jaime, Marcelo
Salamon, Myron B.
Carleschi, Emanuela
Strydom, Andre M.
Fittipaldi, Rosalba
Granata, Veronica
Vecchione, Antonio

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Journal Title

Journal ISSN

Volume Title

Publisher

Nature Publishing Group

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Abstract

Metamagnetism occuring inside a ferromagnetic phase is peculiar. Therefore, Sr₄Ru₃O₁₀, a T_C = 105 K ferromagnet, has attracted much attention in recent years, because it develops a pronounced metamagnetic anomaly below T_C for magnetic fields applied in the crystallographic ab-plane. The metamagnetic transition moves to higher fields for lower temperatures and splits into a double anomaly at critical fields H_{c1} = 2.3 T and H_{c2} = 2.8 T, respectively. Here, we report a detailed study of the different components of the magnetization vector as a function of temperature, applied magnetic field, and varying angle in Sr₄Ru₃O₁₀. We discover for the first time a reduction of the magnetic moment in the plane of rotation at the metamagnetic transition. The anomaly shifts to higher fields by rotating the field from H ⟂ c to H ∥ c. We compare our experimental findings with numerical simulations based on spin reorientation models taking into account magnetocrystalline anisotropy, Zeeman effect and antisymmetric exchange interactions. While Magnetocrystalline anisotropy combined with a Zeeman term are sufficient to explain a metamagnetic transition in Sr₄Ru₃O₁₀, a Dzyaloshinskii-Moriya term is crucial to account for the reduction of the magnetic moment as observed in the experiments.

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Keywords

Ferromagnetism, Crystals, Anisotropy, Magnetic crystals

item.page.sponsorship

National Science Foundation, Division of Material Research under Grant NSF-DMR-1157490.

Rights

CC BY 4.0 (Attribution), ©2017 The Authors

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