Magnetic state switching in FeGa microstructures

Guevara De Jesus, Michael; Xiao, Zhuyun; Goiriena-Goikoetxea, Maite; Chopdekar, Rajesh V.; Panduranga, Mohanchandra K.; Shirazi, Paymon; Acosta, Adrian; Chang, Jane P.; Bokor, Jeffrey; Carman, Gregory P.; Candler, Rob N.; Lynch, Christopher

doi:10.1088/1361-665x/ac46db

Title: Magnetic state switching in FeGa microstructures

Journal Article · 25 January 2022 · Smart Materials and Structures

DOI: https://doi.org/10.1088/1361-665x/ac46db · OSTI ID:1960395

^[1];

^[1]; Goiriena-Goikoetxea, Maite ^[2];

^[3]; Panduranga, Mohanchandra K. ^[1]; Shirazi, Paymon ^[1]; Acosta, Adrian ^[1];

^[1]; Bokor, Jeffrey ^[4]; Carman, Gregory P. ^[1];

^[5]; Lynch, Christopher ^[6]

Univ. of California, Los Angeles, CA (United States)
Univ. of California, Berkeley, CA (United States); Univ. of the Basque Country, Donostia (Spain)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Univ. of California, Berkeley, CA (United States)
Univ. of California, Los Angeles, CA (United States); California Nanotechnology Systems Institute (CNSI), Los Angeles, CA (United States)
Univ. of California, Los Angeles, CA (United States); Univ. of California, Riverside, CA (United States)

This work demonstrates that magnetoelectric composite heterostructures can be designed at the length scale of 10µms that can be switched from a magnetized state to a vortex state, effectively switching the magnetization off, using electric field induced strain. This was accomplished using thin film magnetoelectric heterostructures of Fe_81.4Ga_18.6on a single crystal (011) [Pb(Mg_1/3Nb_2/3)O₃]_0.68-[PbTiO₃]_0.32(PMN-32PT) ferroelectric substrate. Here, the heterostructures were tripped from a multi-domain magnetized state to a flux closure vortex state using voltage induced strain in a piezoelectric substrate. FeGa heterostructures were deposited on a Si-substrate for superconducting quantum interference device magnetometry characterization of the magnetic properties. The magnetoelectric coupling of a FeGa continuous film on PMN-32PT was characterized using a magneto optical Kerr effect magnetometer with bi-axial strain gauges, and magnetic multi-domain heterostructures were imaged using x-ray magnetic circular dichroism—photoemission electron microscopy during the transition to the vortex state. The domain structures were modelled using MuMax³, a micromagnetics code, and compared with observations. The results provide considerable insight into designing magnetoelectric heterostructures that can be switched from an ‘on’ state to an ‘off’ state using electric field induced strain.

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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). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1960395

Journal Information:: Smart Materials and Structures, Journal Name: Smart Materials and Structures Journal Issue: 3 Vol. 31; ISSN 0964-1726

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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