Time-resolved spin-torque switching and enhanced damping in Permalloy/Cu/Permalloy spin-valve nanopillars

Emley, N.C.; Krivorotov, I.N.; ÖZATAY, ÖZHAN; Garcia, A.G.F.; Sankey, J.C.; Ralph, D.C.; Buhrman, R.A.

doi:10.1103/physrevlett.96.247204

Time-resolved spin-torque switching and enhanced damping in Permalloy/Cu/Permalloy spin-valve nanopillars

Emley N., Krivorotov I., ÖZATAY Ö., Garcia A., Sankey J., Ralph D., ...Daha Fazla

Physical Review Letters, cilt.96, sa.24, 2006 (SCI-Expanded, Scopus)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 96 Sayı: 24
Basım Tarihi: 2006
Doi Numarası: 10.1103/physrevlett.96.247204
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: Hayır

Özet

We report time-resolved measurements of current-induced reversal of a free magnetic layer in Permalloy/Cu/Permalloy elliptical nanopillars at temperatures T=4.2K to 160 K. Comparison of the data to Landau-Lifshitz-Gilbert macrospin simulations of the free layer switching yields numerical values for the spin torque and the Gilbert damping parameters as functions of T. The damping is strongly T dependent, which we attribute to the presence of an antiferromagnetic oxide layer around the perimeter of the Permalloy free layer. This adventitious antiferromagnetic oxide can have a major impact on spin-torque phenomena. © 2006 The American Physical Society.