Zero-field spin torque oscillation in Co{sub 2}(Fe, Mn)Si with a point contact geometry

Journal Article · Mon Mar 02 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4914375· OSTI ID:22412760

Kubota, T.; Yako, H.; Takanashi, K. ^[1]; Seki, T. ^[1]; JST PRESTO, Saitama 332-0012 ^[2]

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1. Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan)
2. Japan

We show spin torque oscillation at zero external magnetic field using a point-contact giant magnetoresistance device with a highly spin-polarized Co{sub 2}Fe{sub 0.4}Mn{sub 0.6}Si (CFMS) Heusler alloy. The device emitted a high rf power (P{sub rf}) signal with a narrow spectral linewidth of 3 MHz without external magnetic field. Depending on the applied current, mode changes were clearly observed, and a large P{sub rf} of 25.7 nW was achieved. The large P{sub rf} and the high coherency of oscillation are attributable to the combination of the high spin-polarization of CFMS and the advantages of point-contact geometry.

• OSTI ID: 22412760
• Journal Information: Applied Physics Letters, Vol. 106, Issue 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARBON DIOXIDE
COBALT COMPOUNDS
ELECTRIC CONTACTS
HEUSLER ALLOYS
IRON COMPOUNDS
MAGNETIC FIELDS
MAGNETORESISTANCE
MANGANESE SILICIDES
MHZ RANGE
OSCILLATIONS
SPIN ORIENTATION
TORQUE