We present detailed investigations of the magnetic properties of Pt/CoFeB/MgO layers as studied using the angle-resolved spin-torque ferromagnetic resonance method. Although the measurements provide reasonable magnetic parameters, we obtain an unusual value in the interfacial spin transparency if spin-pumping is assumed to be the dominant source for enhancing magnetic damping (αeff) in the nanometer thickness regime. However, the thickness dependence of the Landé g-factor (geff) for CoFeB indicates that the interfacial spin-orbit coupling plays a role in determining αeff. In addition, the azimuthal asymmetry in the magnetic system may not be related to the possibility of generating unconventional spin polarization. The results in this work are expected to aid in understanding various magnetic properties and current-induced spin-torques in a heavy-metal/ferromagnet bilayer.
Bibliographical noteFunding Information:
This work was supported by the KIST Institutional Program, Institute of Information & Communications Technology Planning & Evaluation (IITP) Grant funded by the Korea government (MSIT) (No. 2019-0-00296), the National Research Foundation of Korea (NRF) program (No. NRF-2020M3F3A2A01081635), and Samsung Electronics Co., Ltd (No. IO201214-08159-01).
© 2022 Author(s).
ASJC Scopus subject areas
- General Physics and Astronomy