Controlling the Transverse Magneto-Optical Kerr Effect in Cr/NiFe Bilayer Thin Films by Changing the Thicknesses of the Cr Layer

Abstract

Here, we demonstrate the impact of ferromagnetic layer coating on controlling the magneto-optical response. We found that the transverse magneto-optical Kerr effect (TMOKE) signal and TMOKE hysteresis loops of Ni80Fe20 thin layers coated with a Cr layer show a strong dependence on the thickness of the Cr layer and the incidence angle of the light. The transmission and reflection spectra were measured over a range of incidence angles and with different wavelengths so as to determine the layers’ optical parameters and to explain the TMOKE behavior. The generalized magneto-optical and ellipsometry (GMOE) model based on modified Abeles characteristic matrices was used to examine the agreement between the experimental and theoretical results. A comprehensive theoretical and experimental analysis reveals the possibility to create a TMOKE suppression/enhancement coating at specific controllable incidence angles. This has potential for applications in optical microscopy and sensors.

A versatile method for exploring the magnetooptical properties of polar saturated and unsaturated ferromagnetic metallic thin films

“…The analyzed multilayer samples contain a single magnetizable layer, namely Co 90 Fe 10 and Co 40 Fe 40 B 20 in Ru/FM/Ta samples (FM = Co 90 Fe 10 and Co 40 Fe 40 B 20 ) on SiO 2 /Si and ZnO substrates. Pure metals and metal alloys have been widely investigated due to their notable and controllable MO response [42][43][44][45][46]. The chosen FM materials, Co 90 Fe 10 and Co 40 Fe 40 B 20 , are commonly used in magneto-electronic devices, for example in TMR and in GMR structures [47,48].…”

Synaptic plasticity investigation in permalloy based channel material for neuromorphic computing

“…Various groups have reported a significant change in electrical properties of electrolyte-gated metallic thin films due to massive charge carrier injection [29][30][31]. In this connection, the suitable properties of metallic permalloy (Ni 80 Fe 20 ) thin films appeal to academic interest and industrial applications due to their exotic magnetic, optical, magnetoelectric properties and low-frequency performance [32][33][34]. Permalloy thin films are intensively studied for their potential use in technological applications such as magneto-resistive random access memory [35], write-read heads [36], non-volatile memory elements [35], sensors [37], magnetic recording [36], novel spintronic and optoelectronic devices [38].…”