We address the cross-effects between mechanical strains and magnetic fields on the plastic response of magnetoelastic amorphous solids. It is well known that plasticity in nonmagnetic amorphous solids under external strain γ is dominated by the codimension-1 saddle-node bifurcation in which an eigenvalue of the Hessian matrix vanishes at γP like √ γP − γ. This squareroot singularity determines ...

Understanding the coercivity mechanism has a substantial impact on developing novel permanent materials. However, the current coercivity mechanisms used widely in permanent alloys cannot explain well the amorphous phase produced hard magnetic behavior of Nd-based bulk amorphous alloys (BAAs). Here, we propose that the coercivity in as-cast Nd60Fe30Al10 alloy is from the combination of magnetic ...

– Carrier dynamics in amorphous a-Si1−xREx (RE = Gd, Y) films has been studied in the doping regime close to the metal-insulator transition by means of infrared spectroscopy. Optical constants throughout the entire intra-gap region ( ω < 1 eV) have been found to be anomalously sensitive to changes of temperature and/or magnetic field. The observed behavior is consistent with the model of hoppin...

The outstanding properties of selected soft magnetic materials make them successful candidates for building high performance sensors. In this paper we present our recent work regarding different sensing technologies based on the coupling of the magnetic properties of soft magnetic materials with their electric or elastic properties. In first place we report the influence on the magneto-impedanc...

We explored the magnetic behavior of a common two-phase nanomag-netic system by Monte Carlo computer simulation of a modified Heisenberg model on a 3D complex lattice with single-and cluster-spins. The effect of exchange coupling between two component magnetic phases was studied on the enhancement in Curie temperature T A c (ECT) of the intergranular amorphous region of a common duplex-phase al...

We report a detailed study of the effects that crystalline disorder has on the magnetic relaxation and quantum tunneling of Mn12 benzoate clusters. Thanks to the absence of interstitial molecules in the crystal structure of this molecular compound, we have been able to isolate the influence of long-range crystalline disorder. For this, we compare results obtained under two extreme situations: a...

1. Introduction To produce modern magnetic materials the rapid cooling from the melt is used very often. The as-prepared material is in an amorphous or microcrystalline form and its optimal properties can be reached after a specific heat treatment. This process results in irreversible changes in the structure and orientation. As a typical example, there are the nanocrystalline materials gained ...

We investigate the statistical properties of the Barkhausen noise in amorphous ferromagnetic films with thicknesses in the range between 100 and 1000 nm. From Barkhausen noise time series measured with the traditional inductive technique, we perform a wide statistical analysis and establish the scaling exponents τ,α,1/σνz, and ϑ. We also focus on the average shape of the avalanches, which gives...