Parameters of Fe/Cr interfacial electron scattering from infrared magnetoreflection

Abstract

The magnetorefractive effect is studied in the infrared spectral region of 2 -13 m in molecular-beam epitaxy-grown ͓Fe͑t Fe , Å͒ / Cr͑10 Å͔͒ n superlattices. The Fe layer thickness varies from 15.3 to 7.2 Å. The effective dielectric function eff and the giant magnetoresistance were measured on the same samples. Relaxation times i ↑͑↓͒ and scattering probabilities P i ↑͑↓͒ of conduction electrons at interfaces, as well as spin asymmetry coefficient ␥ Fe/Cr͑100͒ were obtained from the magnetoreflection in the intraband absorption region. The experimental estimations of the scattering parameters of conduction electrons are compared with the available results of theoretical calculations.

Au dependence of the mid infrared optical and magnetorefractive properties of Ni81Fe19/Au GMR multilayers

“…Discovered in the nineties, the MRE has been observed in different types of structures and has also been used for contactless characterization of magnetotransport properties [8]. To name a few examples, the MRE effect has been studied in a wide variety of metallic and oxide materials systems in the form of thin films, multilayers or granular alloys [9][10][11][12][13][14][15][16][17].…”

Interfacial Electronic Scattering in Fe/Cr Superlattices

“…Then we consider the dependence of the scattering parameters of the conduction electrons on the thickness of Fe layers. The specified parameters were studied previously in Fe/Cr superlattices at 7-15 Å thick Fe layers with 10 Å thick Cr layers [6] and are listed in Table 2. The magnetic properties of a Fe layer are known to change at 7 < Fe t Å, i.e., at the loss of continuity of a magnetic layer, which is manifested in the magnetooptical properties of Fe/Cr superlattices [9].…”

“…3. MRE spectra: (a) AF-exchange region (t Cr =10 Å, model curve is designated by the dashed line[6]) and FM-exchange region (t Cr =23 Å[7]). (b) NC-exchange region.…”

Active photonic platforms for the mid-infrared to the THz regime using spintronic structures

“…In spite of the technical challenge, different groups involved in the growth and study of spintronic systems soon explored the corresponding MRE properties. Apart from the Ni 80 Fe 20 /Cu/Co/Cu multilayers of Jacquet and Valet MRE pioneering work [13], various other systems have been studied in the near and far infrared range, such as Co/Cu [34,36,47,48] and CoFe/Cu multilayers [40,49,50,51]; Fe/Cr structures [52][53][54];…”