KFU. Card publication. Ultrafast signatures of magnetic inhomogeneity in Pd1-xFex (x <= 0.08) epitaxial thin films

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FEDERAL UNIVERSITY

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ULTRAFAST SIGNATURES OF MAGNETIC INHOMOGENEITY IN PD1-XFEX (X <= 0.08) EPITAXIAL THIN FILMS

Form of presentation

Articles in international journals and collections

Year of publication

2022

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Authors, employees of KFU

Gumarov Amir Ildusovich, author

Nikitin Sergey Ivanovich, author

Petrov Andrey Vyacheslavovich, author

Tagirov Lenar Rafgatovich, author

Yusupov Roman Valerevich, author

Yanilkin Igor Vitalevich, author

Bibliographic description in the original language

Petrov AV, Nikitin SI, Tagirov LR, Ultrafast signatures of magnetic inhomogeneity in Pd1-xFex (x <= 0.08) epitaxial thin films//BEILSTEIN JOURNAL OF NANOTECHNOLOGY. - 2022. - Vol.13, Is.. - P.836-844.

Annotation

A series of Pd1−xFex alloy epitaxial films (x = 0, 0.038, 0.062, and 0.080), a material promising for superconducting spintronics, was prepared and studied with ultrafast optical and magneto-optical laser spectroscopy in a wide temperature range of 4–300 K. It was found that the transition to the ferromagnetic state causes a qualitative change of both the reflectivity and the magneto-optical Kerr effect transients. A nanoscale magnetic inhomogeneity of the ferromagnet/paramagnet type inherent in the palladium-rich Pd1−xFex alloys reveals itself through the occurrence of a relatively slow, 10–25 ps, photoinduced demagnetization component following a subpicosecond one; the former vanishes at low temperatures only in the x = 0.080 sample. We argue that the 10 ps timescale demagnetization originates most probably from the diffusive transport of d electrons under the condition of nanoscale magnetic inhomogeneities. The low-temperature fraction of the residual paramagnetic phase can be deduced from the magnitude of the slow reflectivity relaxation component. It is estimated as ≈30% for x = 0.038 and ≈15% for x = 0.062 films. The minimal iron content ensuring the magnetic homogeneity of the ferromagnetic state in the Pd1−xFex alloy at low temperatures is about 7–8 atom %.

Keywords

magnetic inhomogeneities; PdFe alloy; thin epitaxial films; time-resolved magneto-optical Kerr effect; time-resolved optical spectroscopy

The name of the journal

BEILSTEIN JOURNAL OF NANOTECHNOLOGY

URL

https://www.beilstein-journals.org/bjnano/articles/13/74

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

https://repository.kpfu.ru/eng/?p_id=272172&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Gumarov Amir Ildusovich	ru_RU
dc.contributor.author	Nikitin Sergey Ivanovich	ru_RU
dc.contributor.author	Petrov Andrey Vyacheslavovich	ru_RU
dc.contributor.author	Tagirov Lenar Rafgatovich	ru_RU
dc.contributor.author	Yusupov Roman Valerevich	ru_RU
dc.contributor.author	Yanilkin Igor Vitalevich	ru_RU
dc.date.accessioned	2022-01-01T00:00:00Z	ru_RU
dc.date.available	2022-01-01T00:00:00Z	ru_RU
dc.date.issued	2022	ru_RU
dc.identifier.citation	Petrov AV, Nikitin SI, Tagirov LR, Ultrafast signatures of magnetic inhomogeneity in Pd1-xFex (x <= 0.08) epitaxial thin films//BEILSTEIN JOURNAL OF NANOTECHNOLOGY. - 2022. - Vol.13, Is.. - P.836-844.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=272172&p_lang=2	ru_RU
dc.description.abstract	BEILSTEIN JOURNAL OF NANOTECHNOLOGY	ru_RU
dc.description.abstract	A series of Pd1−xFex alloy epitaxial films (x = 0, 0.038, 0.062, and 0.080), a material promising for superconducting spintronics, was prepared and studied with ultrafast optical and magneto-optical laser spectroscopy in a wide temperature range of 4–300 K. It was found that the transition to the ferromagnetic state causes a qualitative change of both the reflectivity and the magneto-optical Kerr effect transients. A nanoscale magnetic inhomogeneity of the ferromagnet/paramagnet type inherent in the palladium-rich Pd1−xFex alloys reveals itself through the occurrence of a relatively slow, 10–25 ps, photoinduced demagnetization component following a subpicosecond one; the former vanishes at low temperatures only in the x = 0.080 sample. We argue that the 10 ps timescale demagnetization originates most probably from the diffusive transport of d electrons under the condition of nanoscale magnetic inhomogeneities. The low-temperature fraction of the residual paramagnetic phase can be deduced from the magnitude of the slow reflectivity relaxation component. It is estimated as ≈30% for x = 0.038 and ≈15% for x = 0.062 films. The minimal iron content ensuring the magnetic homogeneity of the ferromagnetic state in the Pd1−xFex alloy at low temperatures is about 7–8 atom %.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject		ru_RU
dc.title	Ultrafast signatures of magnetic inhomogeneity in Pd1-xFex (x <= 0.08) epitaxial thin films	ru_RU
dc.type	Articles in international journals and collections	ru_RU