Spontaneous Magnetic Superdomain Wall Fluctuations in an Artificial Antiferromagnet

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 ph...

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Bibliographic Details
Published in:Physical review letters 2019-11, Vol.123 (19), p.197202-197202, Article 197202
Main Authors: 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.
Format: Article
Language:English
Subjects:
Antiferromagnetism
artificial spin ice
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Dipolar interaction
Domain walls
Dynamic stability
Dynamics of phase separation
High temperature
Low temperature
Magnetic phase transitions
Magnetization dynamics
MATERIALS SCIENCE
Metamaterials
nanomagnetics
NANOSCIENCE AND NANOTECHNOLOGY
Photon correlation spectroscopy
Random walk
Random walk theory
Soft x rays
Temperature dependence
Variation
X-ray scattering
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.123.197202