Damping Enhancement in Coherent Ferrite–Insulating-Paramagnet Bilayers
Abstract
High-quality epitaxial ferrites, such as low-damping Mg Al -ferrite (MAFO), are promising nanoscale building blocks for all-oxide heterostructures driven by pure spin current. However, the impact of oxide interfaces on spin dynamics in such heterostructures remains an open question. Here in this paper, we investigate the spin dynamics and chemical and magnetic depth profiles of 15-nm-thick MAFO coherently interfaced with an isostructural 1–8-nm-thick overlayer of paramagnetic CoCr2O4 (CCO) as an all-oxide model system. Compared to MAFO without an overlayer, effective Gilbert damping in MAFO/CCO is enhanced by a factor of > 3, irrespective of the CCO overlayer thickness. We attribute this damping enhancement to spin scattering at the approximately 1-nm-thick chemically disordered layer at the MAFO-CCO interface, rather than spin pumping or proximity-induced magnetism. Our results indicate that damping in ferrite-based heterostructures is strongly influenced by interfacial chemical disorder, even if the thickness of the disordered layer is a small fraction of the ferrite thickness.
- Authors:
-
[2];
[6]
- Stanford Univ., CA (United States)
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
- Univ. of Tennessee, Knoxville, TN (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Cornell High Energy Synchrotron Source, Ithaca, NY (United States)
- Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); US Department of the Navy, Office of Naval Research (ONR); National Science Foundation (NSF)
- OSTI Identifier:
- 1631611
- Grant/Contract Number:
- AC02-05CH11231; N00014-15-1-0045; SC0008505
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Applied
- Additional Journal Information:
- Journal Volume: 12; Journal Issue: 5; Journal ID: ISSN 2331-7019
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Wisser, Jacob J., Grutter, Alexander J., Gilbert, Dustin A., N’Diaye, Alpha T., Klewe, Christoph, Shafer, Padraic, Arenholz, Elke, Suzuki, Yuri, and Emori, Satoru. Damping Enhancement in Coherent Ferrite–Insulating-Paramagnet Bilayers. United States: N. p., 2019.
Web. doi:10.1103/PhysRevApplied.12.054044.
Wisser, Jacob J., Grutter, Alexander J., Gilbert, Dustin A., N’Diaye, Alpha T., Klewe, Christoph, Shafer, Padraic, Arenholz, Elke, Suzuki, Yuri, & Emori, Satoru. Damping Enhancement in Coherent Ferrite–Insulating-Paramagnet Bilayers. United States. https://doi.org/10.1103/PhysRevApplied.12.054044
Wisser, Jacob J., Grutter, Alexander J., Gilbert, Dustin A., N’Diaye, Alpha T., Klewe, Christoph, Shafer, Padraic, Arenholz, Elke, Suzuki, Yuri, and Emori, Satoru. Tue .
"Damping Enhancement in Coherent Ferrite–Insulating-Paramagnet Bilayers". United States. https://doi.org/10.1103/PhysRevApplied.12.054044. https://www.osti.gov/servlets/purl/1631611.
@article{osti_1631611,
title = {Damping Enhancement in Coherent Ferrite–Insulating-Paramagnet Bilayers},
author = {Wisser, Jacob J. and Grutter, Alexander J. and Gilbert, Dustin A. and N’Diaye, Alpha T. and Klewe, Christoph and Shafer, Padraic and Arenholz, Elke and Suzuki, Yuri and Emori, Satoru},
abstractNote = {High-quality epitaxial ferrites, such as low-damping Mg Al -ferrite (MAFO), are promising nanoscale building blocks for all-oxide heterostructures driven by pure spin current. However, the impact of oxide interfaces on spin dynamics in such heterostructures remains an open question. Here in this paper, we investigate the spin dynamics and chemical and magnetic depth profiles of 15-nm-thick MAFO coherently interfaced with an isostructural 1–8-nm-thick overlayer of paramagnetic CoCr2O4 (CCO) as an all-oxide model system. Compared to MAFO without an overlayer, effective Gilbert damping in MAFO/CCO is enhanced by a factor of > 3, irrespective of the CCO overlayer thickness. We attribute this damping enhancement to spin scattering at the approximately 1-nm-thick chemically disordered layer at the MAFO-CCO interface, rather than spin pumping or proximity-induced magnetism. Our results indicate that damping in ferrite-based heterostructures is strongly influenced by interfacial chemical disorder, even if the thickness of the disordered layer is a small fraction of the ferrite thickness.},
doi = {10.1103/PhysRevApplied.12.054044},
journal = {Physical Review Applied},
number = 5,
volume = 12,
place = {United States},
year = {2019},
month = {11}
}
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