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Proceedings Paper

Temperature and magnetic-field driven dynamics in artificial magnetic square ice
Author(s): Sophie A. Morley; Aaron Stein; Mark C. Rosamond; Diego Alba Venero; Aleš Hrabec; Philippa M. Shepley; Mi-Young Im; Peter Fischer; Matthew T. Bryan; Dan A. Allwood; Paul Steadman; Sean Langridge; Christopher H. Marrows
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Paper 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 focused 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.

Paper Details

Date Published: 8 September 2015
PDF: 12 pages
Proc. SPIE 9551, Spintronics VIII, 95511Q (8 September 2015); doi: 10.1117/12.2189320
Show Author Affiliations
Sophie A. Morley, Univ. of Leeds (United Kingdom)
Aaron Stein, Brookhaven National Lab. (United States)
Mark C. Rosamond, Univ. of Leeds (United Kingdom)
Diego Alba Venero, STFC Rutherford Appleton Lab. (United Kingdom)
Aleš Hrabec, Univ. of Leeds (United Kingdom)
Philippa M. Shepley, Univ. of Leeds (United Kingdom)
Mi-Young Im, Lawrence Berkeley National Lab. (United States)
Daegu Gyeongbuk Institute of Science and Technology (Korea, Republic of)
Peter Fischer, Lawrence Berkeley National Lab. (United States)
Univ. of California, Santa Cruz (United States)
Matthew T. Bryan, Univ. of Sheffield (United Kingdom)
Dan A. Allwood, Univ. of Sheffield (United Kingdom)
Paul Steadman, Diamond Light Source Ltd. (United Kingdom)
Sean Langridge, STFC Rutherford Appleton Lab. (United Kingdom)
Christopher H. Marrows, Univ. of Leeds (United Kingdom)

Published in SPIE Proceedings Vol. 9551:
Spintronics VIII
Henri-Jean Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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