Frequency Modulation of a Nano-Oxide Layer-Based Spin-Torque Oscillator With FeCo Nanocontacts

• Published in: IEEE transactions on magnetics Vol. 47; no. 10; pp. 3380 - 3382
• Main Authors: Al-Mahdawi, Muftah, Doi, Masaaki, Hashimoto, Susumu, Fuke, Hiromi N., Iwasaki, Hitoshi, Sahashi, Masashi
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.10.2011; Institute of Electrical and Electronics Engineers
• Subjects: Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Ferromagnetic nanocontact (NC); Frequency modulation; Magnetic multilayers; Magnetic resonance; Magnetoresistance; magnetoresistance (MR); Materials science; Microwave oscillators; Nanocontacts; Other topics in materials science; Physics; spin-torque oscillator; spin-transfer torque (STT); Ferromagnetic nanocontact (NC); Oxide layer; magnetoresistance (MR); Oxidation; Magnetoresistance; spintransfer torque (STT); frequency modulation; Oscillators; spintorque oscillator; Magnetic properties
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2011.2159104

We studied the effect of injecting a low-frequency (0.5-1 GHz) ac signal on the natural oscillations of a nano-oxide layer-based nanocontact magnetoresistive spin-torque oscillator with multiple Fe 50 Co 50 nanocontacts. We observed a frequency modulation effect with odd-numbered side bands having low amplitudes. Also, no frequency shift at main spectral peak's frequency, typical with nonlinear frequency modulation, was observed. We could not completely explain this behavior, but we propose that this could be related to the internal dynamics of constricted domain walls.