An ac Susceptibility Study of Mn Substituted Amorphous FeZr Alloys

Abstract

The temperature dependence of the ac susceptibility of amorphous Fe 90Àx Mn x Zr 10 (x 0, 4, 8) has been measured at different ac fields in the frequency range of 80 Hz to 1 kHz. All the compositions of the present study exhibit a double magnetic transition below room temperature. It is found that the Curie temperature T C decreases while the spin-glass transition temperature T f increases as Mn concentration increases from 0 to 8 at%. The values of T C and critical exponent associated with the magnetic susceptibility were extracted from ac susceptibility measurements. The critical exponent is in close agreement with the value predicted by the three-dimensional Heisenberg model. The results obtained here can be explained on the basis of competing exchange interactions below the magnetic ordering temperature.

A small angle neutron scattering study of the spin-glass Fe90Nd3Zr7amorphous alloy

“…From experimental studies a number of different pictures of the SG state have emerged as antiferromagnetic Fe clusters in an FeZr matrix, an FM state with transverse SG ordering, an infinite 3D FM network and finite freezing at random spin clusters [8][9][10]. The replacement of Fe in Fe rich Fe-Zr alloys by any transition metal brings out dramatic changes in their magnetic behaviour [11,12].…”

Critical behavior of weak itinerant ferromagnetFe90−xMnxZrPerumal1, Srinivas2 2003Phys. Rev. BSelf Cite11050View full textAdd to dashboardCite

“…͑b͒ Do weak itinerant electron ferromagnets fall naturally into one of the known universality classes of critical phenomena or do they form a class of their own? The choice of the present series has been dictated by the fact that this series exhibits reentrant behavior over a wide composition range 10 technique in an argon atmosphere. Magnetization measurements were performed in external fields up to 50 kOe over a wide temperature range 0.6T c рTр1.4T c .…”