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Title: Magneto-optical imaging of the first order spin-flop transition in the layered manganite La{sub 1.4}Sr{sub 1.6}Mn{sub 2}O{sub 7}

Abstract

The spin-flop transition in the antiferromagnetic layered manganite La{sub 1.4}Sr{sub 1.6}Mn{sub 2}O{sub 7} was studied using magnetization measurements and a high-resolution magneto-optical imaging technique. We report the direct observation of the formation of ferromagnetic domains appearing at the first order spin-flop transition. The magnetization process proceeds through nucleation of polarized domains at crystal defect sites and not through the expansion of polarized domains due to domain wall motion. A small magnetic hysteresis is caused by the difference between the mechanisms of nucleation and annihilation of domains in the mixed state. These results establish a direct link between the magnetic structure on the atomic scale as seen in neutron scattering and the macroscopic properties of the sample as seen in magnetization and conductivity measurements. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
20216220
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 9; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LANTHANUM OXIDES; STRONTIUM OXIDES; MANGANESE OXIDES; SPIN FLIP; MAGNETO-OPTICAL EFFECTS; IMAGES; MAGNETIZATION; ANTIFERROMAGNETIC MATERIALS; DOMAIN STRUCTURE; EXPERIMENTAL DATA

Citation Formats

Welp, U., Berger, A., Miller, D. J., Vlasko-Vlasov, V. K., Gray, K. E., and Mitchell, J. F. Magneto-optical imaging of the first order spin-flop transition in the layered manganite La{sub 1.4}Sr{sub 1.6}Mn{sub 2}O{sub 7}. United States: N. p., 2000. Web. doi:10.1063/1.373242.
Welp, U., Berger, A., Miller, D. J., Vlasko-Vlasov, V. K., Gray, K. E., & Mitchell, J. F. Magneto-optical imaging of the first order spin-flop transition in the layered manganite La{sub 1.4}Sr{sub 1.6}Mn{sub 2}O{sub 7}. United States. doi:10.1063/1.373242.
Welp, U., Berger, A., Miller, D. J., Vlasko-Vlasov, V. K., Gray, K. E., and Mitchell, J. F. Mon . "Magneto-optical imaging of the first order spin-flop transition in the layered manganite La{sub 1.4}Sr{sub 1.6}Mn{sub 2}O{sub 7}". United States. doi:10.1063/1.373242.
@article{osti_20216220,
title = {Magneto-optical imaging of the first order spin-flop transition in the layered manganite La{sub 1.4}Sr{sub 1.6}Mn{sub 2}O{sub 7}},
author = {Welp, U. and Berger, A. and Miller, D. J. and Vlasko-Vlasov, V. K. and Gray, K. E. and Mitchell, J. F.},
abstractNote = {The spin-flop transition in the antiferromagnetic layered manganite La{sub 1.4}Sr{sub 1.6}Mn{sub 2}O{sub 7} was studied using magnetization measurements and a high-resolution magneto-optical imaging technique. We report the direct observation of the formation of ferromagnetic domains appearing at the first order spin-flop transition. The magnetization process proceeds through nucleation of polarized domains at crystal defect sites and not through the expansion of polarized domains due to domain wall motion. A small magnetic hysteresis is caused by the difference between the mechanisms of nucleation and annihilation of domains in the mixed state. These results establish a direct link between the magnetic structure on the atomic scale as seen in neutron scattering and the macroscopic properties of the sample as seen in magnetization and conductivity measurements. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.373242},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 87,
place = {United States},
year = {2000},
month = {5}
}