Journal
APPLIED PHYSICS LETTERS
Volume 109, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4967843
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Funding
- C-SPIN, one of the six centers of STARnet, a Semiconductor Research Corporation program - MARCO
- FAME, one of the six centers of STARnet, a Semiconductor Research Corporation program - MARCO
- DARPA
- National Science Foundation [ECCS 1611570]
- Nanosystems Engineering Research Center for Translational Applications of Nanoscale Multiferroic Systems (TANMS) [EEC-1160504]
- Spins and Heat in Nanoscale Electronic Systems (SHINES), an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [SC0012670]
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We study the magnetic properties of W/Co40Fe40B20 (CoFeB)/MgO films using the spin-torque ferromagnetic resonance (ST-FMR) technique. This study takes the advantage of the spin Hall magnetoresistance (SMR) for generating an oscillating resistance, which is one of the necessary requirements for obtaining mixing voltage in the ST-FMR technique. We have measured both the as-grown and the annealed samples with different CoFeB layer thicknesses, which include the in-plane and out-of-plane magnetic anisotropies. The spectra for these two types of anisotropies show distinct signatures. By analyzing the ST-FMR spectra, we extract the effective anisotropy field for both types of samples. In addition, we investigate the influence of CoFeB thickness and annealing on the Gilbert damping constant. Our experiments show that by taking advantage of SMR, the ST-FMR measurement acts as an effective tool with high sensitivity for studying the magnetic properties of ultrathin magnetic films. Published by AIP Publishing.
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