Effect of grain size on the soft magnetic properties of FeCoV∕CoNbZr multilayers

Abstract

Articles you may be interested inImproving soft magnetic properties of nanometer CoNbZr films in gigahertz frequency range by electrical pulse annealing J. Appl. Phys. 113, 17A341 (2013); 10.1063/1.4800744 Microfluxgate sensor with amorphous cobalt (Co-Nb-Zr) soft magnetic core for electronic compass J. Appl. Phys. 99, 08M306 (2006); 10.1063/1.2172540 Magnetoresistance and performance of amorphous-Co Nb Zr ∕ Co ∕ Cu ∕ Co magnetic multilayers J. Appl. Phys. 99, 08T105 (2006); 10.1063/1.2171019 ( FeCo/Co-M ) n soft magnetic multilayers with uniaxial anisotropy and very high saturation magnetization J. Appl. Phys. 93, 5498 (2003); 10.1063/1.1563824 Effect of Ti, V, Cr, and Mn additions on the magnetic properties of a nanocrystalline soft magnetic Fe-Zr-B alloy with high magnetic flux densityExperimental characterization of macroscopic effective anisotropy field and coercive field for nanocrystalline ͑FeCoV/ CoNbZr͒ 16 multilayers was carried out with transverse susceptibility. The multilayer structure consisting of a FeCoV ferromagnetic nanogranular layer covered with a CoNbZr amorphous layer was prepared by rf sputtering. All multilayers had the same thickness of CoNbZr ͑3 nm͒ with FeCoV layer thickness varying between 6 and 30 nm. The properties of the optimized multilayer structured films are related to an appropriate grain size of FeCoV where the CoNbZr layer acts as a very effective grain refiner and reduces the average grain size. The experimental values of the coercive force and the macroscopic uniaxial anisotropy were related to the grain size. The values were analyzed according to a two dimensional random anisotropy model which takes into account the uniaxial anisotropy.

Depth-resolved investigation of the lateral magnetic correlations in a gradient nanocrystalline multilayer

“…35 The same FeCoV ferromagnet is also implemented in multilayer structures for applications in spintronics. 37,38,[65][66][67][68] In Sec. V A, a detailed investigation of the remagnetization process by polarized neutron reflectivity with polarization analysis is presented, confirming the previous investigations.…”

“…36 All this, together with the high saturation magnetization of the ferromagnetic layers makes FeCoV an excellent candidate for high-frequency thin film read-head material. 37,38 In this supermirror, the lateral grain size increases with the layer thickness, 39 leading to an increase of the coercive field from the thinnest to the thickest layers. 34 The issue here is to figure out whether the evolution of the lateral grain size reflects itself in an evolution of the layer magnetization reversal mechanism and/or of the lateral magnetic correlations.…”

Magnetic nanoparticles studied by synchroton radiation and rf transverse susceptibility

“…This measurement system consists in probing the ac magnetic susceptibility of a material in one direction while an external bias magnetic field is applied perpendicular to the measurement direction. Analysis of the TS in magnetic materials have demonstrated its potential and versatility to study singular magnetic properties of bulk [36][37][38], single crystals [39], thin films [40][41][42][43] and nanoparticles (NPs) systems [44][45][46][47][48]. TS measurement techniques developed up to date are based Introduction diode oscillator (TDO), the latter acting as an active device for losses compensation in the circuit.…”