System based on a ZVA-67 vector network analyzer for measuring high-frequency parameters of magnetic film structures

Angular Dependence of the Ferromagnetic Resonance Parameters of [Ti/FeNi]6/Ti/Cu/Ti/[FeNi/Ti]6 Nanostructured Multilayered Elements in the Wide Frequency Range

“…The multilayered GMI [Ti(6 nm)/Fe 19 Ni 81 (50 nm)] 6 /Ti(6 nm)/Cu(500nm)/Ti(6 nm)/[Fe 19 Ni 81 (50 nm)Ti(6 nm)] 6 elements were deposited by magnetron sputtering onto Corning glass (Corning Incorporated, Corning, NY, USA) substrates, using a background pressure of 3.0 × 10 −7 mbar and Ar working pressure of 3.8 × 10 −3 mbar [13,30]. Fe 19 Ni 81 composition for the magnetic layers was selected taking into account the fact that it insures the lowest magnetostriction, coercivity and high dynamic magnetic permeability [23,31,35,[39][40][41][42].…”

“…To study high frequency properties of multilayered GMI elements in the frequency range of 0.02 to 6.0 GHz, the measuring system based on the ZVA-67 vector network (VNA) analyzer (Rohde & Schwarz, GmbH & Co. KG, Muenchen, Germany) was created [30]. External magnetic fields of −150 to +150 Oe were generated by Helmholtz coils equipped with a turntable digital goniometer.…”

“…In such geometry, the linear polarization of high frequency magnetic field h corresponds to resonant configuration and h is perpendicular to H direction [24,28]. The advantage of prediction and understanding of GMI behavior of nanoscale multilayers in low applied magnetic fields on the basis of FMR data can be widely used for the design of low field planar detectors with nanostructured magnetic components [30].…”

“…The concept for magnetically soft multilayered structures with ferromagnetic layers thickness at a nanoscale was proposed by different groups [31][32][33], and some of such materials were tested both in GMI and FMR regimes [30]. The proposed concept is a "nanostructuring", i.e., creation of magnetic multilayers with thin ferromagnetic layers separated by thin non-magnetic or magnetic spacers [33,34].…”

“…Nanostructuring allows for avoiding the appearance of the transition into a "transcritical state" typical for thick permalloy films [35]. Although a step forward from classic GMI geometry "ferromagnetic film/conductor/ferromagnetic film" [36][37][38][39][40] to flat nanocomposites "ferromagnetic multilayer/conductor/ferromagnetic multilayer" was made some time ago [31,34], only recently, the wide range FMR measurements have become available for "ferromagnetic multilayer/conductor/ferromagnetic multilayer" kind of GMI-multilayers [30,39]. At the same time neither experimental nor model results are still not available for the angular dependences of the microwave absorption parameters.…”