Tailored Magnetic and Electric States in 3d-Metal-Insulator Films: Characterization and Applications

Abstract

Progress in designing of new low-cost magnetoelectronic planar devices requires new articial lms combining tuneable magnetic and electric properties. In this context, metalinsulator lms are prospective for synthesis of materials with tailored physical properties that could be controlled with lms composition and synthesis regimes. Present overview covers the summary of recent experimental results on complimentary and systematic study of macroscopic and local magnetic properties of lms using vibrating sample magnetometer and Mössbauer spectroscopy with respect to phase composition and structural analysis at nanoscale by X-ray absorption spectroscopy in the extended X-ray absorption ne structure range, transmission electron microscopy and high-resolution transmission electron microscopy. Specic relationship between lms structure and resulting magnetic properties (SP relaxation, core-shell exchange interaction, perpendicular magnetic anisotropy) is considered. Eects of magnetic and electric percolation in lms are discussed in correlation with synthesis regimes (atmosphere of deposition, temperature of the substrate) and lms composition. Physical mechanisms and models describing magnetic and electric properties of composite lms are analyzed. Finally, technological approaches are proposed for tuning lms properties towards their desired combination with respect to application in designing of sensors and planar (non--coil) inductive elements.

FERROMAGNETIC RESONANCE SPECTROSCOPY OF COFEZR-CAF₂ GRANULAR NANOCOMPOSITES

“…The values of g-factor (g) and induction of demagnetizing field B d were determined using the dependence of B r value on the angle θ B between induction B and normal n [23] in assumption of uniform CoFeZr NPs distribution in CaF 2 matrix and homogeneous magnetization of metal nanoparticles (NPs). A quite homogeneous distribution of quasi-spherical FeCoZr NPs inside CaF 2 matrix at x ≤ 50 is clearly confirmed by transmission electron microscopy images presented in [25][26][27], while homogeneous magnetization of NPs is presumed by their small medium diameter within single-domain limit [25][26][27][28].…”