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Title: Optical Detection of Phase-Resolved Ferromagnetic Resonance in Epitaxial FeCo Thin Films

Abstract

We report phased-resolved ferromagnetic resonance (FMR) measurements in an epitaxial Fe50Co50 thin film using a heterodyne, optical detection method. We track the evolution of the precessional phase across the saturated and unsaturated regimes along the FeCo hard axis. For the two regimes, opposite phase evolutions with frequency are observed, which coincide with the negative effective field dependence on the biasing field for the unsaturated modes. In addition, a nonzero phase advance between 0.2 and 0.4 rad is found for the saturated with respect to the unsaturated modes, which indicates an incomplete spatial overlap of the two modes in the film caused by surface pinning effect. The optical method has the advantage of resolving both the spatial and phase information in FMR measurements, which will be closely relevant and adaptable to epitaxial samples with multiple anisotropy axes, and for both flip-chip-based continuous films and spin-torque-based nano-devices.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3];  [3];  [3]; ORCiD logo [4];  [2]; ORCiD logo [3]; ORCiD logo [1]
  1. Oakland Univ., Rochester, MI (United States)
  2. Fudan Univ., Shanghai (China)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. THATec Innovation GMBH, Dresden (Germany)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF); National Key Basic Research Program of China; National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1545347
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Magnetics
Additional Journal Information:
Journal Volume: 55; Journal Issue: 7; Journal ID: ISSN 0018-9464
Publisher:
Institute of Electrical and Electronics Engineers. Magnetics Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 36 MATERIALS SCIENCE; epitaxial films; ferromagnetic resonance; optical detection

Citation Formats

Li, Yi, Zeng, Fanlong, Saglam, Hilal, Sklenar, Joseph, Pearson, John E., Sebastian, Thomas, Wu, Yizheng, Hoffmann, Axel, and Zhang, Wei. Optical Detection of Phase-Resolved Ferromagnetic Resonance in Epitaxial FeCo Thin Films. United States: N. p., 2019. Web. doi:10.1109/TMAG.2019.2893819.
Li, Yi, Zeng, Fanlong, Saglam, Hilal, Sklenar, Joseph, Pearson, John E., Sebastian, Thomas, Wu, Yizheng, Hoffmann, Axel, & Zhang, Wei. Optical Detection of Phase-Resolved Ferromagnetic Resonance in Epitaxial FeCo Thin Films. United States. doi:10.1109/TMAG.2019.2893819.
Li, Yi, Zeng, Fanlong, Saglam, Hilal, Sklenar, Joseph, Pearson, John E., Sebastian, Thomas, Wu, Yizheng, Hoffmann, Axel, and Zhang, Wei. Thu . "Optical Detection of Phase-Resolved Ferromagnetic Resonance in Epitaxial FeCo Thin Films". United States. doi:10.1109/TMAG.2019.2893819.
@article{osti_1545347,
title = {Optical Detection of Phase-Resolved Ferromagnetic Resonance in Epitaxial FeCo Thin Films},
author = {Li, Yi and Zeng, Fanlong and Saglam, Hilal and Sklenar, Joseph and Pearson, John E. and Sebastian, Thomas and Wu, Yizheng and Hoffmann, Axel and Zhang, Wei},
abstractNote = {We report phased-resolved ferromagnetic resonance (FMR) measurements in an epitaxial Fe50Co50 thin film using a heterodyne, optical detection method. We track the evolution of the precessional phase across the saturated and unsaturated regimes along the FeCo hard axis. For the two regimes, opposite phase evolutions with frequency are observed, which coincide with the negative effective field dependence on the biasing field for the unsaturated modes. In addition, a nonzero phase advance between 0.2 and 0.4 rad is found for the saturated with respect to the unsaturated modes, which indicates an incomplete spatial overlap of the two modes in the film caused by surface pinning effect. The optical method has the advantage of resolving both the spatial and phase information in FMR measurements, which will be closely relevant and adaptable to epitaxial samples with multiple anisotropy axes, and for both flip-chip-based continuous films and spin-torque-based nano-devices.},
doi = {10.1109/TMAG.2019.2893819},
journal = {IEEE Transactions on Magnetics},
number = 7,
volume = 55,
place = {United States},
year = {2019},
month = {2}
}

Journal Article:
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This content will become publicly available on February 28, 2020
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