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Size dependence of vortex-type spin torque oscillation in a Co2Fe0.4Mn0.6Si Heusler alloy disk.
- Source :
-
Journal of Physics D: Applied Physics . 2/21/2018, Vol. 51 Issue 7, p1-1. 1p. - Publication Year :
- 2018
-
Abstract
- This paper reports the systematic investigation of vortex-type spin torque oscillation in circular disks of highly spin-polarized Co2Fe0.4Mn0.6Si (CFMS) Heusler alloys. We fabricated the current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) devices with various disk diameters (D) using the layer stack of CFMS/Ag3Mg/CFMS. The gyrotropic motion of the vortex core was successfully excited for the CFMS circular disks with 0.2 µm ⩽ D ⩽ 0.3 µm. The CPP-GMR device with D = 0.2 µm exhibited the Q factor of more than 5000 and the large output power of 0.4 nW owing to the high coherency of vortex dynamics and the high spin-polarization of CFMS. However, the Q factor was remarkably decreased as D was reduced from 0.2 µm to 0.14 µm. The comparison with the calculated resonance frequencies suggested that this degradation of the Q factor was due to the transition of the oscillation mode from the vortex mode to other modes such as the low-coherent out-of-plane precession mode. The present experimental results also suggest that there exists an adequate disk size for the enhanced Q factor of the vortex-type spin torque oscillation. [ABSTRACT FROM AUTHOR]
- Subjects :
- *HEUSLER alloys
*MAGNETORESISTANCE
*SPIN polarization
Subjects
Details
- Language :
- English
- ISSN :
- 00223727
- Volume :
- 51
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Journal of Physics D: Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 127679817
- Full Text :
- https://doi.org/10.1088/1361-6463/aaa748