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Title: The role of iron in magnetic damping of Mg(Al,Fe)2O4 spinel ferrite thin films

Abstract

© 2020 Author(s). We have investigated magnesium aluminum ferrite thin films with a range of iron concentrations and identified the optimal iron content to obtain high crystalline quality thin films with the low magnetic damping required for spin current-based applications. Epitaxial MgAl 2-x FexO4 films with 0.8 < x < 2.0 were grown by pulsed laser deposition on single crystal MgAl2O4 substrates and were characterized structurally and magnetically. We find that the x = 1.5 composition minimizes the room-temperature magnetic damping with a typical Gilbert damping parameter of α eff = 1.8 × 10-3. This minimized damping is governed by a competition between the more robust magnetic ordering with increased iron content, x, and the more defective structure due to larger film-substrate lattice mismatch with increased iron content. The temperature-dependent magnetization curves indicate that Tc is suppressed below room temperature for iron content x ≤ 1.2 and eventually suppressed entirely for x = 0.8. X-ray magnetic circular dichroism results indicate that for all x the magnetic moment is dominated by Fe 3 + cations distributed in a 60:40 ratio on the octahedral and tetrahedral sites, with minimal contribution from Fe 2 + cations. Films with x = 1.4-1.6 exhibit verymore » strong ferromagnetic resonance and low Gilbert damping with α eff = (1.8-6) × 10-3, making them ideal candidates for microwave and spintronic applications.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [2]; ORCiD logo [3]; ORCiD logo [4];  [4];  [4];  [5]; ORCiD logo [1]
  1. Stanford Univ., CA (United States)
  2. Auburn Univ., AL (United States)
  3. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Cornell Univ., Ithaca, NY (United States)
Publication Date:
Research Org.:
Stanford Univ., CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1635662
Alternate Identifier(s):
OSTI ID: 1632948; OSTI ID: 1634082
Grant/Contract Number:  
SC0008505; N00014-15-1-0045; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 116; Journal Issue: 14; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; magnetic insulator; low damping; spin current

Citation Formats

Wisser, Jacob J., Riddiford, Lauren J., Altman, Aaron, Li, Peng, Emori, Satoru, Shafer, Padraic, Klewe, Christoph, N'Diaye, Alpha T., Arenholz, Elke, and Suzuki, Yuri. The role of iron in magnetic damping of Mg(Al,Fe)2O4 spinel ferrite thin films. United States: N. p., 2020. Web. doi:10.1063/5.0003628.
Wisser, Jacob J., Riddiford, Lauren J., Altman, Aaron, Li, Peng, Emori, Satoru, Shafer, Padraic, Klewe, Christoph, N'Diaye, Alpha T., Arenholz, Elke, & Suzuki, Yuri. The role of iron in magnetic damping of Mg(Al,Fe)2O4 spinel ferrite thin films. United States. https://doi.org/10.1063/5.0003628
Wisser, Jacob J., Riddiford, Lauren J., Altman, Aaron, Li, Peng, Emori, Satoru, Shafer, Padraic, Klewe, Christoph, N'Diaye, Alpha T., Arenholz, Elke, and Suzuki, Yuri. Fri . "The role of iron in magnetic damping of Mg(Al,Fe)2O4 spinel ferrite thin films". United States. https://doi.org/10.1063/5.0003628. https://www.osti.gov/servlets/purl/1635662.
@article{osti_1635662,
title = {The role of iron in magnetic damping of Mg(Al,Fe)2O4 spinel ferrite thin films},
author = {Wisser, Jacob J. and Riddiford, Lauren J. and Altman, Aaron and Li, Peng and Emori, Satoru and Shafer, Padraic and Klewe, Christoph and N'Diaye, Alpha T. and Arenholz, Elke and Suzuki, Yuri},
abstractNote = {© 2020 Author(s). We have investigated magnesium aluminum ferrite thin films with a range of iron concentrations and identified the optimal iron content to obtain high crystalline quality thin films with the low magnetic damping required for spin current-based applications. Epitaxial MgAl 2-x FexO4 films with 0.8 < x < 2.0 were grown by pulsed laser deposition on single crystal MgAl2O4 substrates and were characterized structurally and magnetically. We find that the x = 1.5 composition minimizes the room-temperature magnetic damping with a typical Gilbert damping parameter of α eff = 1.8 × 10-3. This minimized damping is governed by a competition between the more robust magnetic ordering with increased iron content, x, and the more defective structure due to larger film-substrate lattice mismatch with increased iron content. The temperature-dependent magnetization curves indicate that Tc is suppressed below room temperature for iron content x ≤ 1.2 and eventually suppressed entirely for x = 0.8. X-ray magnetic circular dichroism results indicate that for all x the magnetic moment is dominated by Fe 3 + cations distributed in a 60:40 ratio on the octahedral and tetrahedral sites, with minimal contribution from Fe 2 + cations. Films with x = 1.4-1.6 exhibit very strong ferromagnetic resonance and low Gilbert damping with α eff = (1.8-6) × 10-3, making them ideal candidates for microwave and spintronic applications.},
doi = {10.1063/5.0003628},
journal = {Applied Physics Letters},
number = 14,
volume = 116,
place = {United States},
year = {2020},
month = {4}
}

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