3 years ago

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

Coexistence of Low Damping and Strong Magnetoelastic Coupling in Epitaxial Spinel Ferrite Thin Films
Greg Haugstad, Joseph Peoples, Nian X. Sun, Alpha T. N'Diaye, Brandon M. Howe, Madelyn Hill, Dongyao Li, David G. Cahill, Keng-Yuan Meng, Fengyuan Yang, Pallavi Dhagat, Alexander C. Bornstein, Matthew T. Gray, Albrecht Jander, Benjamin A. Gray, Krishnamurthy Mahalingam, Hyung-Min Jeon, Michael E. McConney, Padraic Shafer, Sushant Mahat, Yuri Suzuki, Elke Arenholz, Urusa S. Alaan, Maxwell Schmitt, Satoru Emori
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. A new thin-film magnetic insulator, epitaxial spinel NiZnAl-ferrite, with low damping and substantial magnetostriction, is presented. This exceptional combination of properties is enabled by the cation chemistry and coherently strained film growth of the NiZnAl-ferrite. The findings provide a foundation for a new class of low-loss, magnetoelastic thin films that are promising for spin-mechanical devices.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201701130

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