Magnetic skyrmion in hard magnet

Title
Magnetic skyrmion in hard magnet
Authors
장혜정정주영이용우정윤희Jeehoon Kim
Keywords
skyrmions; Lorentz TEM; hard magnet; field cooling
Issue Date
2019-11
Publisher
한국현미경학회
Abstract
Magnetic skyrmions with nontrivial topological spin configuration manifesting ultrahigh-efficiency manipulation current are of prime interest in modern magnetic device technology. Here we report an entirely new class of skyrmions in hard magnet using Lorentz TEM. In contrast to previously reported skyrmions, the new type of skyrmion and its variant appear only via field-cool procedure due to a high thermomagnetic irreversibility and show a high level of phase robustness. Futhermore, we also find and manipulate room-temperature skyrmionic bubble using in-situ heating and biasing TEM holder. The discovery and manipulation of skyrmions and skyrmionic bubbles in a rare earth material not only offers a new design principle for suited skyrmions via a control of the dual nature of f electrons, but also lifts a major hurdle for device applications arising from the narrow window of existing skyrmion materials.
URI
http://pubs.kist.re.kr/handle/201004/62830
ISSN
-
Appears in Collections:
KIST Publication > Conference Paper
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