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Title: Magnetic anisotropy and order structure of L1{sub 0}-FePt(001) single-crystal films grown epitaxially on (001) planes of MgO, SrTiO{sub 3}, and MgAl{sub 2}O{sub 4} substrates

Abstract

L1{sub 0}–FePt(001) single-crystal films were grown epitaxially on SrTiO{sub 3}(001), MgAl{sub 2}O{sub 4}(001), and MgO(001) substrates. Their uniaxial magnetic anisotropy K{sub u} and the order structure were examined for the film thickness t range of 2–14 nm. All series of films show large K{sub u} of 4 × 10{sup 7} erg/cm{sup 3} in the thickness range higher than 10 nm, with order parameter S of 0.8 and saturation magnetization M{sub s} of 1120 emu/cm{sup 3}. K{sub u} decreased gradually as t decreased. The K{sub u} reduction was considerable when t decreased from 4 nm to 2 nm. No marked difference in the thickness dependence of K{sub u} was found in any series of films, although the lattice mismatch between FePt and the substrates was markedly different. K{sub u} reduction showed good agreement with the reduction of S for the films on MgAl{sub 2}O{sub 4} and MgO. The K{sub u} ∼ S{sup 2} plot showed an almost linear relation, which is in good agreement with theoretical predictions. Transmission electron microscopy images for a FePt film on MgO substrate revealed that the lattice mismatch between FePt(001) and MgO(001) was relaxed in the initial 1 or 2 layers of FePt(001) lattices, which is likely to be true also for two other series ofmore » films.« less

Authors:
; ;  [1];  [1];  [2]; ; ;  [3];  [1];  [2]
  1. Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578 (Japan)
  2. (Japan)
  3. Institute of Multidisciplinary Research for Advanced Material, Tohoku University, Sendai 980-8577 (Japan)
Publication Date:
OSTI Identifier:
22273889
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM COMPOUNDS; ANISOTROPY; CRYSTAL DEFECTS; EPITAXY; INTERMETALLIC COMPOUNDS; IRON; LAYERS; MAGNESIUM OXIDES; MAGNETIZATION; MONOCRYSTALS; ORDER PARAMETERS; PLATINUM; STRONTIUM TITANATES; SUBSTRATES; THIN FILMS; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Hotta, A., E-mail: hotta@riec.tohoku.ac.jp, Hatayama, M., Tsumura, K., Ono, T., Fuji Electric Co., Ltd., Tokyo 191-8502, Kikuchi, N., Okamoto, S., Kitakami, O., Shimatsu, T., and Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577. Magnetic anisotropy and order structure of L1{sub 0}-FePt(001) single-crystal films grown epitaxially on (001) planes of MgO, SrTiO{sub 3}, and MgAl{sub 2}O{sub 4} substrates. United States: N. p., 2014. Web. doi:10.1063/1.4862840.
Hotta, A., E-mail: hotta@riec.tohoku.ac.jp, Hatayama, M., Tsumura, K., Ono, T., Fuji Electric Co., Ltd., Tokyo 191-8502, Kikuchi, N., Okamoto, S., Kitakami, O., Shimatsu, T., & Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577. Magnetic anisotropy and order structure of L1{sub 0}-FePt(001) single-crystal films grown epitaxially on (001) planes of MgO, SrTiO{sub 3}, and MgAl{sub 2}O{sub 4} substrates. United States. doi:10.1063/1.4862840.
Hotta, A., E-mail: hotta@riec.tohoku.ac.jp, Hatayama, M., Tsumura, K., Ono, T., Fuji Electric Co., Ltd., Tokyo 191-8502, Kikuchi, N., Okamoto, S., Kitakami, O., Shimatsu, T., and Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577. Wed . "Magnetic anisotropy and order structure of L1{sub 0}-FePt(001) single-crystal films grown epitaxially on (001) planes of MgO, SrTiO{sub 3}, and MgAl{sub 2}O{sub 4} substrates". United States. doi:10.1063/1.4862840.
@article{osti_22273889,
title = {Magnetic anisotropy and order structure of L1{sub 0}-FePt(001) single-crystal films grown epitaxially on (001) planes of MgO, SrTiO{sub 3}, and MgAl{sub 2}O{sub 4} substrates},
author = {Hotta, A., E-mail: hotta@riec.tohoku.ac.jp and Hatayama, M. and Tsumura, K. and Ono, T. and Fuji Electric Co., Ltd., Tokyo 191-8502 and Kikuchi, N. and Okamoto, S. and Kitakami, O. and Shimatsu, T. and Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577},
abstractNote = {L1{sub 0}–FePt(001) single-crystal films were grown epitaxially on SrTiO{sub 3}(001), MgAl{sub 2}O{sub 4}(001), and MgO(001) substrates. Their uniaxial magnetic anisotropy K{sub u} and the order structure were examined for the film thickness t range of 2–14 nm. All series of films show large K{sub u} of 4 × 10{sup 7} erg/cm{sup 3} in the thickness range higher than 10 nm, with order parameter S of 0.8 and saturation magnetization M{sub s} of 1120 emu/cm{sup 3}. K{sub u} decreased gradually as t decreased. The K{sub u} reduction was considerable when t decreased from 4 nm to 2 nm. No marked difference in the thickness dependence of K{sub u} was found in any series of films, although the lattice mismatch between FePt and the substrates was markedly different. K{sub u} reduction showed good agreement with the reduction of S for the films on MgAl{sub 2}O{sub 4} and MgO. The K{sub u} ∼ S{sup 2} plot showed an almost linear relation, which is in good agreement with theoretical predictions. Transmission electron microscopy images for a FePt film on MgO substrate revealed that the lattice mismatch between FePt(001) and MgO(001) was relaxed in the initial 1 or 2 layers of FePt(001) lattices, which is likely to be true also for two other series of films.},
doi = {10.1063/1.4862840},
journal = {Journal of Applied Physics},
number = 17,
volume = 115,
place = {United States},
year = {Wed May 07 00:00:00 EDT 2014},
month = {Wed May 07 00:00:00 EDT 2014}
}