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 journalArticle

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

Keywords

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

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Emori, S., Gray, B. A., Jeon, H. M., Peoples, J., Schmitt, M., Mahalingam, K., Hill, M., McConney, M. E., Gray, M. T., Alaan, U. S., Bornstein, A. C., Shafer, P., N'Diaye, A. T., Arenholz, E., Haugstad, G., Meng, K. Y., Yang, F., Li, D., Mahat, S., ... Howe, B. M. (2017). Coexistence of Low Damping and Strong Magnetoelastic Coupling in Epitaxial Spinel Ferrite Thin Films. Advanced Materials, 29(34), [1701130]. https://doi.org/10.1002/adma.201701130