KFU. Card publication. Physical Review B

KAZAN
FEDERAL UNIVERSITY

- RUS
- 中文
- ES

PHYSICAL REVIEW B

Form of presentation

Articles in international journals and collections

Year of publication

2021

Язык

английский

Authors, employees of KFU

Tagirov Lenar Rafgatovich, author

Other authors

Khaydukov Yuriy N., author

Bibliographic description in the original language

Chirality of Bloch domain walls in exchange-biased CoO/Co bilayer studied by waveguide-enhanced neutron spin-flip scattering / Yu.N. Khaydukov, D. Lenk, V. Zdravkov, R. Morari, T. Keller, A.S. Sidorenko , L.R. Tagirov, R. Tidecks, S. Horn, B. Keimer // Physical Review B. – 2021. – V.104. – Art.174445. DOI: 10.1103/PhysRevB.104.174445

Annotation

The magnetic state of exchanged biased CoO(20 nm)/Co(dF) bilayers (dF = 5-20 nm) was studied by means of polarized neutron reflectometry. By introducing a Nb(20 nm) spacer layer between the CoO/Co bilayer and the Al203 substrate, we designed a resonator structure with significantly enhanced intensity of the spin-flip (5F) scattering at the position of the optical resonances. For the trained sample with thinnest Co layer (dF = 5 nm), we detected strong SF scattering at the resonance position to the amount of 30% of the incoming intensity, pointing to a high degree of non-collinearity of the magnetization. With increasing dF, the intensity of the SF scattering decreases linearly. Furthermore, an unconventional asymmetry of up-down and down-up scattering channels at the resonance positions was observed, which we ascribe to the out-of-plane magnetic stray field generated by chiral Bloch domain walls. This field leads to Zeeman splitting of the neutron energies depending on the initial neutron spin polarization. The chirality of the domain walls is assigned to the Dzyaloshinskii-Moriya interaction emerging at the CoO/Co interface. Our observations might prove useful for the design of spintronic devices based on the exchange bias effect.

Keywords

Domain walls, exchange bias, magnetic domains, magnetic switching

The name of the journal

Physical Review B - Condensed Matter and Materials Physics

URL

https://doi.org/10.1103/PhysRevB.104.174445

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=306798&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Tagirov Lenar Rafgatovich	ru_RU
dc.contributor.author	Khaydukov Yuriy N.	ru_RU
dc.date.accessioned	2021-01-01T00:00:00Z	ru_RU
dc.date.available	2021-01-01T00:00:00Z	ru_RU
dc.date.issued	2021	ru_RU
dc.identifier.citation	Chirality of Bloch domain walls in exchange-biased CoO/Co bilayer studied by waveguide-enhanced neutron spin-flip scattering / Yu.N. Khaydukov, D. Lenk, V. Zdravkov, R. Morari, T. Keller, A.S. Sidorenko , L.R. Tagirov, R. Tidecks, S. Horn, B. Keimer // Physical Review B. – 2021. – V.104. – Art.174445. DOI: 10.1103/PhysRevB.104.174445	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=306798&p_lang=2	ru_RU
dc.description.abstract	Physical Review B - Condensed Matter and Materials Physics	ru_RU
dc.description.abstract	The magnetic state of exchanged biased CoO(20 nm)/Co(dF) bilayers (dF = 5-20 nm) was studied by means of polarized neutron reflectometry. By introducing a Nb(20 nm) spacer layer between the CoO/Co bilayer and the Al203 substrate, we designed a resonator structure with significantly enhanced intensity of the spin-flip (5F) scattering at the position of the optical resonances. For the trained sample with thinnest Co layer (dF = 5 nm), we detected strong SF scattering at the resonance position to the amount of 30% of the incoming intensity, pointing to a high degree of non-collinearity of the magnetization. With increasing dF, the intensity of the SF scattering decreases linearly. Furthermore, an unconventional asymmetry of up-down and down-up scattering channels at the resonance positions was observed, which we ascribe to the out-of-plane magnetic stray field generated by chiral Bloch domain walls. This field leads to Zeeman splitting of the neutron energies depending on the initial neutron spin polarization. The chirality of the domain walls is assigned to the Dzyaloshinskii-Moriya interaction emerging at the CoO/Co interface. Our observations might prove useful for the design of spintronic devices based on the exchange bias effect.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	Domain walls	ru_RU
dc.subject	exchange bias	ru_RU
dc.subject	magnetic domains	ru_RU
dc.subject	magnetic switching	ru_RU
dc.title	Physical Review B	ru_RU
dc.type	Articles in international journals and collections	ru_RU