Depth-Selective Study of Surface Crystallization in NANOPERM-Type Alloys

Abstract

Evolution of structure and magnetic order is studied in the 57 Fe81Mo8Cu1B10 alloy by conversion electron and conversion X-ray 57 Fe Mössbauer spectrometry. Surface features exhibit dierences at both sides of ribbon-shaped samples with respect to the screening depth. In the as-quenched state, traces of magnetite (in addition to bcc-Fe) are revealed only at the wheel side of the ribbon to the depth of about 200 nm. It is present also after annealing up to 510• C, then it disappears. In deeper regions (down to 1 µm), magnetite is less abundant. At the air side, only bcc-Fe is detected, though the progress of crystallization is more pronounced here than at the wheel side. Vibration properties of the bulk of amorphous and nanocrystalline samples are obtained from experiments of nuclear inelastic scattering of synchrotron radiation using partial densities of phonon states.

Nanocrystallization of Metallic Glasses Followed by in situ Nuclear Forward Scattering of Synchrotron Radiation

“…But now, we have selected MG that is almost purely paramagnetic at room temperature, namely Fe 81 Mo 8 Cu 1 B 10 . Only minute amounts of surface crystallization were unveiled by CEMS [37] on both sides of ribbon-shaped samples.…”

Magnetocaloric Properties of Fe75Mo8Cu1B16and Fe81Mo8Cu1B10Metallic Glasses

“…Consequently, changes in the Curie temperature are expected. The Fe 81 Mo 8 Cu 1 B 10 system is partially crystallized even after the preparation [5] and shows further progress of crystallization after annealing. Therefore, in the following we will concentrate our attention to the Fe 75 Mo 8 Cu 1 B 16 alloy.…”