Broadband Spectroscopy of Thermodynamic Magnetization Fluctuations through a Ferromagnetic Spin-Reorientation Transition
Abstract
We use scanning optical magnetometry to study the broadband frequency spectra of spontaneous magnetization fluctuations, or “magnetization noise,” in an archetypal ferromagnetic film that can be smoothly tuned through a spin-reorientation transition (SRT). The SRT is achieved by laterally varying the magnetic anisotropy across an ultrathin trilayer, from the perpendicular to in-plane direction, via graded irradiation. In regions exhibiting perpendicular anisotropy, the power spectrum of the magnetization noise exhibits a remarkably robust power law over frequencies from 1 kHz to 1 MHz. As the SRT region is traversed, however, spectra develop a steadily increasing critical frequency , below which the noise power is spectrally flat, indicating an evolving low-frequency cutoff for magnetization fluctuations. The magnetization noise depends strongly on applied in- and out-of-plane magnetic fields, revealing local anisotropies and also a field-induced emergence of fluctuations in otherwise stable ferromagnetic films. Finally, we demonstrate that higher-order correlators can be computed from the noise. These results highlight broadband spectroscopy of thermodynamic fluctuations as a powerful tool to characterize the interplay between thermal and magnetic energy scales, and as a means of characterizing phase transitions in ferromagnets.
- Authors:
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE; LANL Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)
- OSTI Identifier:
- 1471805
- Alternate Identifier(s):
- OSTI ID: 1479988
- Report Number(s):
- LA-UR-18-22421
Journal ID: ISSN 2160-3308; PRXHAE; 031078
- Grant/Contract Number:
- AC52-06NA25396; DMR-1157490
- Resource Type:
- Published Article
- Journal Name:
- Physical Review. X
- Additional Journal Information:
- Journal Name: Physical Review. X Journal Volume: 8 Journal Issue: 3; Journal ID: ISSN 2160-3308
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; High Magnetic Field Science
Citation Formats
Balk, A. L., Li, F., Gilbert, I., Unguris, J., Sinitsyn, N. A., and Crooker, S. A. Broadband Spectroscopy of Thermodynamic Magnetization Fluctuations through a Ferromagnetic Spin-Reorientation Transition. United States: N. p., 2018.
Web. doi:10.1103/PhysRevX.8.031078.
Balk, A. L., Li, F., Gilbert, I., Unguris, J., Sinitsyn, N. A., & Crooker, S. A. Broadband Spectroscopy of Thermodynamic Magnetization Fluctuations through a Ferromagnetic Spin-Reorientation Transition. United States. https://doi.org/10.1103/PhysRevX.8.031078
Balk, A. L., Li, F., Gilbert, I., Unguris, J., Sinitsyn, N. A., and Crooker, S. A. Fri .
"Broadband Spectroscopy of Thermodynamic Magnetization Fluctuations through a Ferromagnetic Spin-Reorientation Transition". United States. https://doi.org/10.1103/PhysRevX.8.031078.
@article{osti_1471805,
title = {Broadband Spectroscopy of Thermodynamic Magnetization Fluctuations through a Ferromagnetic Spin-Reorientation Transition},
author = {Balk, A. L. and Li, F. and Gilbert, I. and Unguris, J. and Sinitsyn, N. A. and Crooker, S. A.},
abstractNote = {We use scanning optical magnetometry to study the broadband frequency spectra of spontaneous magnetization fluctuations, or “magnetization noise,” in an archetypal ferromagnetic film that can be smoothly tuned through a spin-reorientation transition (SRT). The SRT is achieved by laterally varying the magnetic anisotropy across an ultrathin Pt/Co/Pt trilayer, from the perpendicular to in-plane direction, via graded Ar+ irradiation. In regions exhibiting perpendicular anisotropy, the power spectrum of the magnetization noise S(ν) exhibits a remarkably robust ν-3/2 power law over frequencies ν from 1 kHz to 1 MHz. As the SRT region is traversed, however, S(ν) spectra develop a steadily increasing critical frequency ν0, below which the noise power is spectrally flat, indicating an evolving low-frequency cutoff for magnetization fluctuations. The magnetization noise depends strongly on applied in- and out-of-plane magnetic fields, revealing local anisotropies and also a field-induced emergence of fluctuations in otherwise stable ferromagnetic films. Finally, we demonstrate that higher-order correlators can be computed from the noise. These results highlight broadband spectroscopy of thermodynamic fluctuations as a powerful tool to characterize the interplay between thermal and magnetic energy scales, and as a means of characterizing phase transitions in ferromagnets.},
doi = {10.1103/PhysRevX.8.031078},
journal = {Physical Review. X},
number = 3,
volume = 8,
place = {United States},
year = {Fri Sep 21 00:00:00 EDT 2018},
month = {Fri Sep 21 00:00:00 EDT 2018}
}
https://doi.org/10.1103/PhysRevX.8.031078
Web of Science
Figures / Tables:
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