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Crystallization of optically thick films of CoxFe 80-xB20

Evolution of optical, magneto-optical, and structural properties
 
: Sharma, A.; Hoffmann, M.A.; Matthes, P.; Hellwig, O.; Kowol, C.; Schulz, S.E.; Zahn, D.R.T.; Salvan, G.

:

Physical Review. B 101 (2020), Nr.5, Art. 054438
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
ISSN: 2469-9950
Englisch
Zeitschriftenaufsatz
Fraunhofer ENAS ()

Abstract
CoFeB alloys are highly relevant materials for spintronic applications. In this work, the crystallization of CoFeB alloys triggered by thermal annealing was investigated by x-ray diffraction techniques and scanning electron microscopy, as well as spectroscopic ellipsometry and magneto-optical Kerr effect spectroscopy for annealing temperatures ranging from 300 to
600∘C. The transformation of ∼100-nm- thick CoxFe 80-xB20 films from amorphous to polycrystalline was revealed by the sharpening of spectral features observed in optical and magneto-optical dielectric functions spectra. The influence of B on the dielectric function was assessed both experimentally and by optical modeling. By analyzing the Drude component of the optical dielectric function, a consistent trend between the charge-carrier scattering time/resistivity and the annealing temperature was observed, in agreement with the electrical investigations by means of the four-point-probe method.

: http://publica.fraunhofer.de/dokumente/N-596600.html