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Temperature and magnetic-field driven dynamics in artificial magnetic square ice

Title
Temperature and magnetic-field driven dynamics in artificial magnetic square ice
Authors
Morley, S.A.Stein, A.Rosamond, M.C.Venero, D.A.Hrabec, A.Shepley, P.M.Im, M.-Y.Fischer, P.Bryan, M.T.Allwood, D.A.Steadman, P.Langridge, S.Marrows, C.H.
DGIST Authors
Im, M.-Y.
Issue Date
2015
Citation
Spintronics VIII, 9551
Type
Conference
Article Type
Conference Paper
ISBN
9780000000000
ISSN
0277-786X
Abstract
Artificial spin ices are often spoken of as being realisations of some of the celebrated vertex models of statistical mechanics, where the exact microstate of the system can be imaged using advanced magnetic microscopy methods. The fact that a stable image can be formed means that the system is in fact athermal and not undergoing the usual finite-temperature fluctuations of a statistical mechanical system. In this paper we report on the preparation of artificial spin ices with islands that are thermally fluctuating due to their very small size. The relaxation rate of these islands was determined using variable frequency focussed magneto-optic Kerr measurements. We performed magnetic imaging of artificial spin ice under varied temperature and magnetic field using X-ray transmission microscopy which uses X-ray magnetic circular dichroism to generate magnetic contrast. We have developed an on-membrane heater in order to apply temperatures in excess of 700 K and have shown increased dynamics due to higher temperature. Due to the photon-in, photon-out' method employed here, it is the first report where it is possible to image the microstates of an ASI system under the simultaneous application of temperature and magnetic field, enabling the determination of relaxation rates, coercivties, and the analysis of vertex population during reversal. © 2015 SPIE.
URI
http://hdl.handle.net/20.500.11750/3697
DOI
10.1117/12.2189320
Publisher
SPIE
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceETC2. Conference Papers


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