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

Wisser, Jacob J.; Riddiford, Lauren J.; Altman, Aaron; Li, Peng; Emori, Satoru; Shafer, Padraic; Klewe, Christoph; N'Diaye, Alpha T.; Arenholz, Elke; Suzuki, Yuri

doi:10.1063/5.0003628

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

Journal Article · 10 April 2020 · Applied Physics Letters

DOI: https://doi.org/10.1063/5.0003628 · OSTI ID:1635662

^[1];

^[1]; Altman, Aaron ^[1]; Li, Peng ^[2];

^[3];

^[4]; Klewe, Christoph ^[4]; N'Diaye, Alpha T. ^[4]; Arenholz, Elke ^[5];

^[1]

Stanford Univ., CA (United States)
Auburn Univ., AL (United States)
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Cornell Univ., Ithaca, NY (United States)

© 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.

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Research Organization:: Stanford Univ., CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; US Department of the Navy, Office of Naval Research (ONR); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0008505; N00014-15-1-0045; AC02-05CH11231

OSTI ID:: 1635662

Alternate ID(s):: OSTI ID: 1632948; OSTI ID: 1634082

Journal Information:: Applied Physics Letters, Vol. 116, Issue 14; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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

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