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Magnetodynamics in orthogonal nanocontact spin-torque nano-oscillators based on magnetic tunnel junctions

Journal article
Authors S. Jiang
Martina Ahlberg
S. Chung
Afshin Houshang
R. Ferreira
P. P. Freitas
Johan Åkerman
Published in Applied Physics Letters
Volume 115
Issue 15
Pages 5
ISSN 0003-6951
Publication year 2019
Published at Department of Physics (GU)
Pages 5
Language en
Links dx.doi.org/10.1063/1.5121356
Keywords ferromagnetic-resonance, large magnetoresistance, phase-locking, driven, temperature, generation, dependence, power, Physics
Subject categories Physical Sciences

Abstract

We demonstrate field and current controlled magnetodynamics in nanocontact spin-torque nano-oscillators based on orthogonal magnetic tunnel junctions. We systematically analyze the microwave properties (frequency f, linewidth Delta f, power P, and frequency tunability df/dI) with their physical origins-perpendicular magnetic anisotropy, dampinglike and fieldlike spin transfer torque (STT), and voltage-controlled magnetic anisotropy (VCMA). These devices present several advantageous characteristics: high emission frequencies (f>20 GHz), high frequency tunability (df/dI=0.25 GHz/mA), and zero-field operation (f similar to 4 GHz). Furthermore, detailed investigation of f(H, I) reveals that df/dI is mostly governed by the large VCMA [287 fJ/(V m)], while STT plays a negligible role.

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