Coexistence of Low Damping and Strong Magnetoelastic Coupling in Epitaxial Spinel Ferrite Thin Films

Satoru Emori, Benjamin A. Gray, Hyung Min Jeon, Joseph Peoples, Maxwell Schmitt, Krishnamurthy Mahalingam, Madelyn Hill, Michael E. McConney, Matthew T. Gray, Urusa S. Alaan, Alexander C. Bornstein, Padraic Shafer, Alpha T. N'Diaye, Elke Arenholz, Greg Haugstad, Keng Yuan Meng, Fengyuan Yang, Dongyao Li, Sushant Mahat, David G. CahillPallavi Dhagat, Albrecht Jander, Nian X. Sun, Yuri Suzuki, Brandon M. Howe

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

Low-loss magnetization dynamics and strong magnetoelastic coupling are generally mutually exclusive properties due to opposing dependencies on spin–orbit interactions. So far, the lack of low-damping, magnetostrictive ferrite films has hindered the development of power-efficient magnetoelectric and acoustic spintronic devices. Here, magnetically soft epitaxial spinel NiZnAl-ferrite thin films with an unusually low Gilbert damping parameter (<3 × 10−3), as well as strong magnetoelastic coupling evidenced by a giant strain-induced anisotropy field (≈1 T) and a sizable magnetostriction coefficient (≈10 ppm), are reported. This exceptional combination of low intrinsic damping and substantial magnetostriction arises from the cation chemistry of NiZnAl-ferrite. At the same time, the coherently strained film structure suppresses extrinsic damping, enables soft magnetic behavior, and generates large easy-plane magnetoelastic anisotropy. These findings provide a foundation for a new class of low-loss, magnetoelastic thin film materials that are promising for spin-mechanical devices.

Original languageEnglish (US)
Article number1701130
JournalAdvanced Materials
Volume29
Issue number34
DOIs
StatePublished - Sep 13 2017

Bibliographical note

Funding Information:
S.E. and B.A.G. contributed equally to this work. This material is based upon work supported by the Air Force Office of Scientific Research under Award No. FA9550-15RXCOR198. The work at Stanford University was supported by the Vannevar Bush Faculty Fellowship program sponsored by the Basic Research Office of the Assistant Secretary of Defense for Research and Engineering and funded by the Office of Naval Research through grant N00014-15-1-0045. Part of this work was performed at the Stanford Nano Shared Facilities (SNSF), supported by the National Science Foundation under Award No. ECCS-1542152. The Advanced Light Source was supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The work at the Ohio State University was supported by the National Science Foundation under Grant No. DMR-1507274 (VSM). The work at Oregon State University was partially supported by National Science Foundation Award No. 1414416. S.E. would like to thank Praveen Gowtham and Christoph Klewe for their critical reading of the manuscript.

Publisher Copyright:
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • epitaxy
  • ferromagnetic resonance
  • magnetic damping
  • magnetostriction
  • spinel ferrite

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