Strong linewidth variation for spin-torque nano-oscillators as a function of in-plane magnetic field angle

Thadani, K.V.; Finocchio, G.; Li, Z.-P.; ÖZATAY, ÖZHAN; Sankey, J.C.; Krivorotov, I.N.; Cui, Y.-T.; Buhrman, R.A.; Ralph, D.C.

doi:10.1103/physrevb.78.024409

Strong linewidth variation for spin-torque nano-oscillators as a function of in-plane magnetic field angle

Thadani K., Finocchio G., Li Z., ÖZATAY Ö., Sankey J., Krivorotov I., ...Daha Fazla

Physical Review B - Condensed Matter and Materials Physics, cilt.78, sa.2, 2008 (SCI-Expanded, Scopus)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 78 Sayı: 2
Basım Tarihi: 2008
Doi Numarası: 10.1103/physrevb.78.024409
Dergi Adı: Physical Review B - Condensed Matter and Materials Physics
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
Boğaziçi Üniversitesi Adresli: Hayır

Özet

We measure the microwave signals produced by spin-torque-driven magnetization dynamics excited by direct currents in patterned magnetic multilayer devices at room temperature as a function of the angle of a magnetic field applied in the sample plane. We find strong variations in the frequency linewidth of the signals, with a decrease by more than a factor of 20 as the field is rotated from the magnetic easy axis to the in-plane hard axis. Based on micromagnetic simulations, we identify these variations as due to a transition from spatially incoherent to coherent precession. © 2008 The American Physical Society.