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Title: Direct 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.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
11956
Report Number(s):
ANL/MSD/CP-99964
TRN: AH200119%%145
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 44th Annual Conference on Magnetism and Magnetic Materials, San Jose, CA (US), 11/15/1999--11/18/1999; Other Information: PBD: 31 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTAL DEFECTS; HYSTERESIS; SPIN; PHASE TRANSFORMATIONS; ANTIFERROMAGNETIC MATERIALS; LANTHANUM OXIDES; STRONTIUM OXIDES; MANGANESE OXIDES; MAGNETO-OPTICAL EFFECTS; NEUTRON DIFFRACTION; ELECTRIC CONDUCTIVITY

Citation Formats

Berger, A., Gray, K. E., Miller, D. J., Mitchell, J. F., Vlasko-Vlasov, V. K., and Welp, U. Direct 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., 1999. Web.
Berger, A., Gray, K. E., Miller, D. J., Mitchell, J. F., Vlasko-Vlasov, V. K., & Welp, U. Direct 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.
Berger, A., Gray, K. E., Miller, D. J., Mitchell, J. F., Vlasko-Vlasov, V. K., and Welp, U. Tue . "Direct 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. https://www.osti.gov/servlets/purl/11956.
@article{osti_11956,
title = {Direct 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 = {Berger, A. and Gray, K. E. and Miller, D. J. and Mitchell, J. F. and Vlasko-Vlasov, V. K. and Welp, U.},
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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {8}
}

Conference:
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