Magnetooptical, Optical, and Magnetotransport Properties of Co/Cu Superlattices with Ultrathin Cobalt Layers / Lobov I. D.,Kirillova M. M.,Makhnev A. A.,Romashev L. N.,Korolev A. V.,Milyaev M. A.,Proglyado V. V.,Bannikova N. S.,Ustinov V. V. // PHYSICS OF THE SOLID STATE. - 2017. - V. 59, l. 1. - P. 53-62.

ISSN/EISSN:

1063-7834 / 1090-6460

Type:

Article

Abstract:

We investigated the field dependences of the magnetization and magnetoresistance of superlattices {[}Co(t(x), angstrom)/Cu( 9.6 angstrom)](30) prepared by magnetron sputtering, differing in the thickness of cobalt layers (0.3 angstrom <= t(co) <= 15 angstrom). The optical and magnetooptical properties of these objects were studied by ellipsometry in the spectral region of h omega= 0.09-6.2 eV and with the help of the transverse Kerr effect ( h omega= 0.5-6.2 eV). In the curves of an off-diagonal component of the tensor of the optical conductivity of superlattices with t(Co) = 3-15 angstrom, a structure of oscillatory type ({''}loop{''}) was detected in the ultraviolet region, resulting from the exchange splitting of the 3d band in the energy spectrum of the face-centered cubic structure of cobalt ( fcc Co). Based on magnetic experiments and measurements of the transverse Kerr effect, we found the presence of a superparamagnetic phase in Co/Cu superlattices with a thickness of the cobalt layers of 3 and 2 angstrom. The transition from superlattices with solid ferromagnetic layers to superparamagnetic cluster-layered nanostructures and further to the structures based on Co and Cu ( t(Co) = 0.3-1 angstrom) with a Kondo-like characteristics of the electrical resistivity at low temperatures is analyzed.

Author keywords:

GIANT MAGNETORESISTANCE; BAND-STRUCTURE; MULTILAYERS; FILMS

DOI:

10.1134/S1063783417010206

Web of Science ID:

ISI:000394984600009

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JAN
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1090-6460
Keywords-Plus	GIANT MAGNETORESISTANCE; BAND-STRUCTURE; MULTILAYERS; FILMS
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
Author-Email	i\_lobov@imp.uran.ru
ResearcherID-Numbers	Ustinov, Vladimir/G-7501-2011 Bannikova, Nataly/J-5273-2013 Milyaev, Mikhail/J-8070-2013
ORCID-Numbers	Ustinov, Vladimir/0000-0002-5155-7947 Bannikova, Nataly/0000-0002-8716-5128 Milyaev, Mikhail/0000-0001-7828-3571 Korolev, Aleksandr/0000-0002-5104-3997
Funding-Acknowledgement	Federal Agency of Scientific Organizations of the Russian Federation {[}01201463330]; Russian Foundation for Basic Research {[}16-02-00061-a]; program of the Ural Branch, Russian Academy of Sciences, ``Fundamentals of Technology of Nanostructures and Nanomaterials{''} {[}15-9-2-22]; program of the Ministry of Education and Science of the Russian Federation {[}14.Z50.31.0025]
Funding-Text	The work was supported as a part the state contract of the Federal Agency of Scientific Organizations of the Russian Federation (project Spin, no. 01201463330) with a partial support of the Russian Foundation for Basic Research (project no. 16-02-00061-a); the program of the Ural Branch, Russian Academy of Sciences, ``Fundamentals of Technology of Nanostructures and Nanomaterials{''} (project no. 15-9-2-22); and the program of the Ministry of Education and Science of the Russian Federation (project no. 14.Z50.31.0025).
Number-of-Cited-References	26
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	3
Journal-ISO	Phys. Solid State
Doc-Delivery-Number	EM0BU