Journal
NATURE ELECTRONICS
Volume 4, Issue 1, Pages 30-37Publisher
NATURE RESEARCH
DOI: 10.1038/s41928-020-00506-4
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Funding
- Ministry of Education of the Czech Republic infrastructure grant CzechNanoLab [LM2018110, LNSM-LNSpin]
- Ministry of Education of the Czech Republic infrastructure grant MGLM [LM2018096]
- Czech Science Foundation [19-28375X]
- Charles University grant GA UK [886317, 1582417]
- EU FET Open RIA grant [766566]
- Engineering and Physical Sciences Research Council [EP/P019749/1]
- Royal Society
- Neuron Foundation Prize
- Neuron Foundation Impuls grant
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Electrical and ultrashort optical pulses can deterministically induce and reverse nano-fragmented domain states in antiferromagnetic CuMnAs, leading to a reversible and reproducible process with approximately 20% changes in system resistance at room temperature. This phenomenon opens up new possibilities for the application of antiferromagnetic materials in spintronic devices.
Electrical and short optical pulses can be used to deterministically induce and reverse a nano-fragmented domain state in antiferromagnetic CuMnAs, in a process that can be probed via changes in the resistance of the system. Antiferromagnets are of potential use in the development of spintronic devices due to their ultrafast dynamics, insensitivity to external magnetic fields and absence of magnetic stray fields. Similar to their ferromagnetic counterparts, antiferromagnets can store information in the orientations of the collective magnetic order vector. However, the readout magnetoresistivity signals in simple antiferromagnetic films are weak, and reorientation of the magnetic order vector via optical excitation has not yet been achieved. Here we report the reversible and reproducible quenching of antiferromagnetic CuMnAs into nano-fragmented domain states using either electrical or ultrashort optical pulses. The changes in the resistivity of the system approach 20% at room temperature, which is comparable to the giant magnetoresistance ratios in ferromagnetic multilayers. We also obtain a signal readout by optical reflectivity.
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