Temperature and magnetic field dependence of rareearthiron exchange resonance mode in a magnetic oxide studied with femtosecond magneto-optical Kerr effect

Marwan Deb, Pierre Molho, Bernard Barbara, and Jean-Yves Bigot
Phys. Rev. B 94, 054422 – Published 22 August 2016

Abstract

In magnetic materials, the exchange is the strongest quantum interaction due to the Pauli exclusion principle. For that reason it can induce high-frequency modes fexch of the magnetization precession. In this work we investigate these modes over a wide range of temperatures (50300K) and magnetic fields up to 10T in a bismuth-doped garnet with perpendicular magnetic anisotropy by performing femtosecond magneto-optical pump-probe experiments. Near the compensation temperature TM the divergence of 1/fexch(T) allows identifying unambiguously fexch with the rare-earth iron exchange mode. In addition, at low temperature fexch is independent of the field as usually observed. In contrast, we find that near TM,fexch decreases linearly with an increasing magnetic field. This behavior is explained in the context of the ferromagnetic resonance theory by including the perturbation term linear in the external applied field Hext.

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  • Received 6 May 2016

DOI:https://doi.org/10.1103/PhysRevB.94.054422

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Marwan Deb1,*, Pierre Molho2,3, Bernard Barbara2,3, and Jean-Yves Bigot1,†

  • 1Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 CNRS, Université de Strasbourg, 67034 Strasbourg, France
  • 2CNRS, Institut Néel, F-38042 Grenoble, France
  • 3Université Grenoble Alpes, Institut Néel, F-38042 Grenoble, France

  • *Corresponding author: marwan.deb@ipcms.unistra.fr
  • Corresponding author: bigot@unistra.fr

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Issue

Vol. 94, Iss. 5 — 1 August 2016

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