Open this publication in new window or tab >>Sumy State University, Kharkivska Str. 116, Sumy 40007, Ukraine, Kharkivska Str. 116.
Sumy State University, Kharkivska Str. 116, Sumy 40007, Ukraine, Kharkivska Str. 116.
Sumy State University, Kharkivska Str. 116, Sumy 40007, Ukraine, Kharkivska Str. 116.
Sumy State University, Kharkivska Str. 116, Sumy 40007, Ukraine, Kharkivska Str. 116.
Sumy State University, Kharkivska Str. 116, Sumy 40007, Ukraine, Kharkivska Str. 116.
Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, Košice 04001, Slovakia, Watsonova 47; Institute of Physics, P.J. Šafárik University, Park Angelinum 9, Košice 04001, Slovakia, Park Angelinum 9.
Institute of Physics, P.J. Šafárik University, Park Angelinum 9, Košice 04001, Slovakia, Park Angelinum 9.
Institute of Magnetism, NAS of Ukraine and MES of Ukraine, Acad. Vernadsky Blvd., 36-b, Kyiv 03142, Ukraine, Acad. Vernadsky Blvd., 36-b.
KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics. Institute of Magnetism, NAS of Ukraine and MES of Ukraine, Acad. Vernadsky Blvd., 36-b, Kyiv 03142, Ukraine, Acad. Vernadsky Blvd., 36-b; Nanostructure Physics, Royal Institute of Technology, Stockholm 10691, Sweden.
Faculty of Mathematics, Physics and Informatics, Comenius University Bratislava, Mlynská dolina F2, Bratislava 84248, Slovakia, Mlynská dolina F2; Sumy State University, Kharkivska Str. 116, Sumy 40007, Ukraine, Kharkivska Str. 116.
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2024 (English)In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 606, article id 172327Article in journal (Refereed) Published
Abstract [en]
We present the results of experimental studies of the influence of an external magnetic field on the structural characteristics (surface roughness and structural entropy) of nanogranular thin-film system based on Co and Cu. The samples CoxCu100-x in a wide range of compositions (17 at. % ≤ x ≤ 69 at. %) with the thickness of d = 35 nm were obtained by electron-beam co-evaporation using two independent electron guns. After obtaining, the films were annealed in a vacuum at a temperature of 800 K for 30 min. The studies of magnetoresistive properties have shown that the maximum giant magnetoresistance (GMR) amplitude (1.7 % in the transverse and 1.6 % in the longitudinal measurement geometries) in a magnetic field of H = 4.5 kOe at room temperature was observed in the Co21Cu79 film alloy. Transmission electron microscopy showed that this sample contains hcp-Co granules with a size of L = 5 ÷ 12 nm in a matrix of metastable fcc-Cu(Co) solid solution. The influence of the external magnetic field on the structural characteristics and surface morphology of the Co21Cu79 thin-film alloy was investigated using atomic force microscopy (AFM). It was found that a first impact of application of external magnetic field with H = 0.5 kOe causes a decrease in the values of the arithmetic mean Ra, and quadratic mean Rq, of the film roughness and structural entropy S. A decreases in Ra by 8.5 %, Rq by 6.5 %, and structural entropy S by 6.5 % were observed. After application of a larger magnetic field with H = 1.0 kOe and during the subsequent relaxation of the structure within 15 h after the field is turned off, the values of the structural parameters of the film surface did not change significantly.
Place, publisher, year, edition, pages
Elsevier BV, 2024
Keywords
Atomic force microscopy, Giant magnetoresistance, Magnetic aftereffect phenomenon, Magnetic nanogranular heterostructure, Surface roughness
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-351785 (URN)10.1016/j.jmmm.2024.172327 (DOI)001279696300001 ()2-s2.0-85199380643 (Scopus ID)
Note
QC 20240823
2024-08-132024-08-132024-08-27Bibliographically approved