Magnetocrystalline anisotropy and exchange probed by high-field anomalous Hall effect in fully-compensated half-metallic Mn2RuxGa thin films

Ciarán Fowley, Karsten Rode, Yong Chang Lau, Naganivetha Thiyagarajah, Davide Betto, Kiril Borisov, Gwenaël Atcheson, Erik Kampert, Zhaosheng Wang, Ye Yuan, Shengqiang Zhou, Jürgen Lindner, Plamen Stamenov, J. M.D. Coey, Alina Maria Deac

Research output: Contribution to journalArticlepeer-review

Abstract

Magnetotransport is investigated in thin films of the half-metallic ferrimagnet Mn2RuxGa in pulsed magnetic fields of up to 58 T. A non-vanishing Hall signal is observed over a broad temperature range, spanning the compensation temperature (155 K), where the net magnetic moment is strictly zero, the anomalous Hall conductivity is 6673 Ω−1 m−1 and the coercivity exceeds 9 T. Molecular field modelling is used to determine the intra- and inter-sublattice exchange constants and from the spin-flop transition we infer the anisotropy of the electrically active sublattice to be 216 kJ m−3 and predict the magnetic resonances frequencies. Exchange and anisotropy are comparable and hard-axis applied magnetic fields result in a tilting of the magnetic moments from their collinear ground state. Our analysis is applicable to collinear ferrimagnetic half-metal systems.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - 2018 Oct 2

Keywords

  • Anomalous Hall effect
  • Exchange interaction
  • Ferrimagnetism
  • Half-metals
  • Magnetic anisotropy
  • Magnetotransport

ASJC Scopus subject areas

  • General

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