Intrinsic frequency doubling in an MgO-based spin torque oscillator.

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3647759· OSTI ID:1029452

Muduli, P K; Akerman, J ^[1]

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1. Materials Science Division

We show that the frequency of a magnetic tunnel junction (MTJ)-based spin torque oscillator (STO) can be doubled and the first harmonic entirely suppressed by orienting the free and fixed layer magnetizations in an antiparallel (AP) state. The angular dependence of the harmonics allows us to extract the free layer precession angle, which follows a parabolic decrease from a maximum of 20{sup o} in the AP state to about 10{sup o} at 25{sup o} of misalignment. Frequency-doubling provides both a promising way for increasing the frequency of MTJ-STOs and a means for high-rate frequency shift keying using only a small magnetic field.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC); Swedish Foundation for Strategic Research; Swedish Research Council (SRC)
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 1029452
• Report Number(s): ANL/MSD/JA-70508; JAPIAU; TRN: US201123%%294
• Journal Information: Journal of Applied Physics, Vol. 110, Issue 7; ISSN 0021-8979
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
HARMONICS
MAGNETIC FIELDS
OSCILLATORS
PRECESSION
SPIN
TORQUE
TUNNEL EFFECT