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Title: Ultralow Damping in Nanometer-Thick Epitaxial Spinel Ferrite Thin Films

Abstract

Pure spin currents, unaccompanied by dissipative charge flow, are essential for realizing energy-efficient nanomagnetic information and communications devices. Thin-film magnetic insulators have been identified as promising materials for spin-current technology because they are thought to exhibit lower damping compared with their metallic counterparts. However, insulating behavior is not a sufficient requirement for low damping, as evidenced by the very limited options for low-damping insulators. Here, we demonstrate a new class of nanometer-thick ultralow-damping insulating thin films based on design criteria that minimize orbital angular momentum and structural disorder. Specifically, we show ultralow damping in <20 nm thick spinel-structure magnesium aluminum ferrite (MAFO), in which magnetization arises from Fe 3+ ions with zero orbital angular momentum. Here, these epitaxial MAFO thin films exhibit a Gilbert damping parameter of ~0.0015 and negligible inhomogeneous linewidth broadening, resulting in narrow half width at half-maximum linewidths of ~0.6 mT around 10 GHz. Our findings offer an attractive thin-film platform for enabling integrated insulating spintronics.

Authors:
ORCiD logo [1];  [2];  [2];  [2];  [2];  [3]; ORCiD logo [4];  [4];  [4];  [5];  [5];  [5];  [2];  [4];  [2]
  1. Stanford Univ., Stanford, CA (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  2. Stanford Univ., Stanford, CA (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. Air Force Research Lab., Wright-Patterson Air Force Base, OH (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1470932
Grant/Contract Number:  
[AC02-76SF00515; FA9550-16-1-0235; FA9550-15RXCOR198; N00014-15-1-0045; DMR-1402685]
Resource Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
[ Journal Volume: 18; Journal Issue: 7]; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; epitaxy; ferromagnetic resonance; Gilbert damping; Spinel ferrite

Citation Formats

Emori, Satoru, Yi, Di, Crossley, Sam, Wisser, Jacob J., Balakrishnan, Purnima P., Khodadadi, Behrouz, Shafer, Padraic, Klewe, Christoph, N’Diaye, Alpha T., Urwin, Brittany T., Mahalingam, Krishnamurthy, Howe, Brandon M., Hwang, Harold Y., Arenholz, Elke, and Suzuki, Yuri. Ultralow Damping in Nanometer-Thick Epitaxial Spinel Ferrite Thin Films. United States: N. p., 2018. Web. doi:10.1021/acs.nanolett.8b01261.
Emori, Satoru, Yi, Di, Crossley, Sam, Wisser, Jacob J., Balakrishnan, Purnima P., Khodadadi, Behrouz, Shafer, Padraic, Klewe, Christoph, N’Diaye, Alpha T., Urwin, Brittany T., Mahalingam, Krishnamurthy, Howe, Brandon M., Hwang, Harold Y., Arenholz, Elke, & Suzuki, Yuri. Ultralow Damping in Nanometer-Thick Epitaxial Spinel Ferrite Thin Films. United States. doi:10.1021/acs.nanolett.8b01261.
Emori, Satoru, Yi, Di, Crossley, Sam, Wisser, Jacob J., Balakrishnan, Purnima P., Khodadadi, Behrouz, Shafer, Padraic, Klewe, Christoph, N’Diaye, Alpha T., Urwin, Brittany T., Mahalingam, Krishnamurthy, Howe, Brandon M., Hwang, Harold Y., Arenholz, Elke, and Suzuki, Yuri. Thu . "Ultralow Damping in Nanometer-Thick Epitaxial Spinel Ferrite Thin Films". United States. doi:10.1021/acs.nanolett.8b01261. https://www.osti.gov/servlets/purl/1470932.
@article{osti_1470932,
title = {Ultralow Damping in Nanometer-Thick Epitaxial Spinel Ferrite Thin Films},
author = {Emori, Satoru and Yi, Di and Crossley, Sam and Wisser, Jacob J. and Balakrishnan, Purnima P. and Khodadadi, Behrouz and Shafer, Padraic and Klewe, Christoph and N’Diaye, Alpha T. and Urwin, Brittany T. and Mahalingam, Krishnamurthy and Howe, Brandon M. and Hwang, Harold Y. and Arenholz, Elke and Suzuki, Yuri},
abstractNote = {Pure spin currents, unaccompanied by dissipative charge flow, are essential for realizing energy-efficient nanomagnetic information and communications devices. Thin-film magnetic insulators have been identified as promising materials for spin-current technology because they are thought to exhibit lower damping compared with their metallic counterparts. However, insulating behavior is not a sufficient requirement for low damping, as evidenced by the very limited options for low-damping insulators. Here, we demonstrate a new class of nanometer-thick ultralow-damping insulating thin films based on design criteria that minimize orbital angular momentum and structural disorder. Specifically, we show ultralow damping in <20 nm thick spinel-structure magnesium aluminum ferrite (MAFO), in which magnetization arises from Fe3+ ions with zero orbital angular momentum. Here, these epitaxial MAFO thin films exhibit a Gilbert damping parameter of ~0.0015 and negligible inhomogeneous linewidth broadening, resulting in narrow half width at half-maximum linewidths of ~0.6 mT around 10 GHz. Our findings offer an attractive thin-film platform for enabling integrated insulating spintronics.},
doi = {10.1021/acs.nanolett.8b01261},
journal = {Nano Letters},
number = [7],
volume = [18],
place = {United States},
year = {2018},
month = {5}
}

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