Thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice

Morley, Sophie A.; Porro, Jose Maria; Hrabec, Aleš; Rosamond, Mark C.; Venero, Diego Alba; Linfield, Edmund H.; Burnell, Gavin; Im, Mi-Young; Fischer, Peter; Langridge, Sean; Marrows, Christopher H.

doi:10.1038/s41598-019-52460-7

Title: Thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice

Journal Article · 05 November 2019 · Scientific Reports

DOI: https://doi.org/10.1038/s41598-019-52460-7 · OSTI ID:1580413

Morley, Sophie A. ^[1]; Porro, Jose Maria ^[2]; Hrabec, Aleš ^[3]; Rosamond, Mark C. ^[3]; Venero, Diego Alba ^[4];

^[3];

^[3]; Im, Mi-Young ^[5];

^[6];

^[4];

^[3]

Univ. of Leeds, Leeds (United Kingdom); Univ. of California, Santa Cruz, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron and Muon Source; BCMaterials, Basque Center for Materials, Applications and Nanostructures, Leioa (Spain); Ikerbasque, Basque Foundation for Science, Bilbao (Spain)
Univ. of Leeds, Leeds (United Kingdom)
Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron and Muon Source
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Daegu Gyeongbuk Inst. of Science and Technology, Daegu (Korea)
Univ. of California, Santa Cruz, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Designing and constructing model systems that embody the statistical mechanics of frustration is now possible using nanotechnology. We have arranged nanomagnets on a two-dimensional square lattice to form an artificial spin ice, and studied its fractional excitations, emergent magnetic monopoles, and how they respond to a driving field using X-ray magnetic microscopy. We observe a regime in which the monopole drift velocity is linear in field above a critical field for the onset of motion. The temperature dependence of the critical field can be described by introducing an interaction term into the Bean-Livingston model of field-assisted barrier hopping. By analogy with electrical charge drift motion, we define and measure a monopole mobility that is larger both for higher temperatures and stronger interactions between nanomagnets. The mobility in this linear regime is described by a creep model of zero-dimensional charges moving within a network of quasi-one-dimensional objects.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Research Foundation (NRF) of Korea; EPSRC

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1580413

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 9; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

References (79)

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Exploring hyper-cubic energy landscapes in thermally active finite artificial spin-ice systems Farhan, A.; Derlet, P. M.; Kleibert, A. Nature Physics, Vol. 9, Issue 6 https://doi.org/10.1038/nphys2613	journal	May 2013
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