Spontaneous Magnetic Superdomain Wall Fluctuations in an Artificial Antiferromagnet.

Chen, X M; Farmer, B; Woods, J S; Dhuey, S; Hu, W; Mazzoli, C; Wilkins, S B; Chopdekar, R V; Scholl, A; Robinson, I K; De Long, L E; Roy, S; Hastings, J T

Chen, X M; Farmer, B; Woods, J S; Dhuey, S; Hu, W; Mazzoli, C; Wilkins, S B; Chopdekar, R V; Scholl, A; Robinson, I K; De Long, L E; Roy, S; Hastings, J T.

Afiliação

Chen XM; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Farmer B; Department of Electrical and Computer Engineering, University of Kentucky, Lexington, Kentucky 40506, USA.
Woods JS; Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA.
Dhuey S; Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA.
Hu W; Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA.
Mazzoli C; Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Wilkins SB; National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, USA.
Chopdekar RV; National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, USA.
Scholl A; National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, USA.
Robinson IK; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
De Long LE; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Roy S; Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
Hastings JT; London Centre for Nanotechnology, University College, Gower Street, London WC1E 6BT, United Kingdom.

Phys Rev Lett ; 123(19): 197202, 2019 Nov 08.

Article em En | MEDLINE | ID: mdl-31765174

ABSTRACT

ABSTRACT

Collective dynamics often play an important role in determining the stability of ground states for both naturally occurring materials and metamaterials. We studied the temperature dependent dynamics of antiferromagnetically ordered superdomains in a square artificial spin lattice using soft x-ray photon correlation spectroscopy. We observed an exponential slowing down of superdomain wall motion below the antiferromagnetic onset temperature, similar to the behavior of typical bulk antiferromagnets. Using a continuous time random walk model we show that these superdomain walls undergo low-temperature ballistic and high-temperature diffusive motions.

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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2019 Tipo de documento: Article

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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2019 Tipo de documento: Article