Ferromagnetic domain behavior and phase transition in bilayer manganites investigated at the nanoscale

Phatak, C.; Petford-Long, A. K.; Zheng, H.; Mitchell, J. F.; Rosenkranz, S.; Norman, M. R.

doi:10.1103/PhysRevB.92.224418

Title: Ferromagnetic domain behavior and phase transition in bilayer manganites investigated at the nanoscale

Journal Article · Mon Dec 14 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.224418· OSTI ID:1339106

Phatak, C. ^[1]; Petford-Long, A. K. ^[2]; Zheng, H. ^[1]; Mitchell, J. F. ^[1]; Rosenkranz, S. ^[1]; Norman, M. R. ^[1]

Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering

Understanding the underlying mechanism and phenomenology of colossal magnetoresistance in manganites has largely focused on atomic and nanoscale physics such as double exchange, phase separation, and charge order. Here in this article, we consider a more macroscopic view of manganite materials physics, reporting on the ferromagnetic domain behavior in a bilayer manganite sample with a nominal composition of La_2-2xSr_1+2xMn₂O₇ with x = 0:38, studied using in-situ Lorentz transmission electron microscopy. The role of magnetocrystalline anisotropy on the structure of domain walls was elucidated. On cooling, magnetic domain contrast was seen to appear first at the Curie temperature within the a - b plane. With further reduction in temperature, the change in area fraction of magnetic domains was used to estimate the critical exponent describing the ferromagntic phase transition. Lastly, the ferromagnetic phase transition was accompanied by a distinctive nanoscale granular contrast close to the Curie temperature, which we infer to be related to the presence of ferromagnetic nanoclusters in a paramagnetic matrix, which has not yet been reported in bilayer manganites.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1339106

Alternate ID(s):: OSTI ID: 1229586

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 22; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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