Giant Anisotropy of Gilbert Damping in Epitaxial CoFe Films

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Li Y., Zeng F., Zhang S. S., Shin H., Saglam H., Karakas V., ...Daha Fazla

Physical Review Letters, cilt.122, sa.11, 2019 (SCI-Expanded, Scopus)

• Yayın Türü: Makale / Tam Makale
• Cilt numarası: 122 Sayı: 11
• Basım Tarihi: 2019
• Doi Numarası: 10.1103/physrevlett.122.117203
• Dergi Adı: Physical Review Letters
• Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
• Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
• Boğaziçi Üniversitesi Adresli: Evet

Özet

Tailoring Gilbert damping of metallic ferromagnetic thin films is one of the central interests in spintronics applications. Here we report a giant Gilbert damping anisotropy in epitaxial Co50Fe50 thin films with a maximum-minimum damping ratio of 400%, determined by broadband spin-torque ferromagnetic resonance as well as inductive ferromagnetic resonance. We conclude that the origin of this damping anisotropy is the variation of the spin orbit coupling for different magnetization orientations in the cubic lattice, which is further corroborated from the magnitude of the anisotropic magnetoresistance in Co50Fe50.