The effects of Cr addition and neutron irradiation on the magnetic properties of Fe30Ni48−xCrxMo2Si5B15 amorphous alloys (0 ⩽ x ⩽ 12) are investigated by the temperature dependence of the magnetic saturation polarization over the temperature range 4.2 to 160 K. The mean magnetic moment per 3d atom, μ3d, the spin-wave stiffness constant, D, the exchange constant, Aex, and the average mean-square range of the exchange interaction, 〈r2〉, are determined for samples irradiated with total fluences 0,5 × 1017, and 5 × 1018 neutrons/cm2. Two concentration ranges below and above about 6 at% Cr content are found, having different D, TC, and 〈r2〉 concentration dependences and radiation sensitivities.



[Russian Text Ignored].

Magnetization studies of Cr concentration and neutron irradiation effects in Fe30Ni48-xCrxMo2Si5B15 amorphous alloys

Enhanced performance of magnetoelectric laminated composites by geometry engineering for high frequency applications

Due to their excellent magnetic properties, amorphous metallic alloys (AMAs) are considered for the construction of magnetic cores of radio-frequency cavities in accelerators. Here, they might be exposed to ion bombardment. The influence of irradiation by both light and heavy ions featuring low and high energies, respectively, is followed by the techniques of 57Fe Mossbauer spectrometry. Modifications of surface layers in selected Fe-containing AMAs after ion irradiation are unveiled by detection of conversion electrons and photons of characteristic radiation whereas those in their bulk are derived from standard transmission spectra. Rearrangement of microstructure which favors the formation of magnetically active regions, is observed in surface regions bombarded by light ions. Heavy ions caused pronounced effects in the orientation of net magnetization of the irradiated samples. No measurable impact upon short-range order arrangement was observed. Part I of this paper is devoted to radiation effects in Fe-based AMAs induced by neutron irradiation.

Radiation Effects in Amorphous Metallic Alloys as Revealed by Mössbauer Spectrometry: Part II. Ion Irradiation

The changes of some magnetic parameters of Fe85−xCrxB15 glassy metals due to n-irradiation are investigated. The mean magnetic moment per transition metal atom exp remains almost constant after n-irradiation. It is found that the spin-wave stiffness constant D, the exchange constant Aex, and the Curie temperature Tc gradually increase with n-irradiation. However, the coercivity shows the opposite behaviour.

Some Magnetic Properties of Neutron Irradiated Fe85−xCrxB15 Metallic Glasses

Saturation magnetostriction and Curie temperature of neutron irradiated Fe75Cr10B15 and Fe77Cr8B15 amorphous alloys

The effect of boron content and the effect of anisotropy energy on the magnetic aftereffect (MAE) Δr/r, the initial susceptibility χ10, the perminvar critical field Hcr, the coercive force Hc in as-quenched and annealed (below TC) Co100−xBx (17.3 ≦ x ≦ 30) amorphous alloys is investigated.



Der Einflus des Borgehaltes und der Einflus der Anisotropie-Energie auf die magnetische Nachwirkung Δr/r, die Anfangssuszeptibilitat χ10, das kritische Feld Hcr des Perminvar-Effekts, die Koerzitivfeldstarke Hc in unbehandelten und angelassenen Co100—xBx (17,3 ≦ x ≦ 30) Legierungen wird untersucht.

A. Lovas

Papers

Some Magnetic Properties of Neutron Irradiated Fe85−xCrxB15 Metallic Glasses

Saturation magnetostriction and Curie temperature of neutron irradiated Fe75Cr10B15 and Fe77Cr8B15 amorphous alloys

Magnetic properties of Co100-xBx amorphous alloys