Thermal and spontaneous remagnetization in ferromagneticNd3(Fe,Ti)29and

S.J. Collocott

¹

,

John B. Dunlop

²

,

P.A. Watterson

³

Abstract

Magnetization measurements at 10 K on the dc demagnetized ferromagnetic intermetallic compounds Nd 3 ͑Fe, Ti͒ 29 and Nd 3 ͑Fe, Re͒ 29 are reported and reveal the phenomena of thermal and spontaneous remagnetization. For both materials, thermal remagnetization is about an order of magnitude larger than the spontaneous remagnetization. The thermal remagnetization data are fitted using the model of Schumann and Jahn ͓J. Magn. Magn. Mater. 232, 231 ͑2001͔͒, with the modification that the random magnetic field component is fully correlated between the demagnetization branch and the recoil branch, instead of uncorrelated. A Preisach approach is used to interpret the observed spontaneous magnetization.

Nonergodic thermodynamics of disordered ferromagnets and ferroelectrics

“…Also in Ref. [23] "thermal remagnetization" similar to that in Fig. 13 was observed in disordered ferromagnets N d 3 (F e, T i) 29 and N d 3 (F e, Re) 29 .…”

“…Also in Ref. [23] "thermal remagnetization" similar to that in and N d 3 (F e, Re) 29 . The depolarization and polarization on heating were also seen in PLZT ferroelectric ceramics 24,25 .…”

“…It is rather difficult to find from the existing numerical results the possible interrelations between a variety of historydependent phenomena observed in different experimental regimes, see Refs. [17][18][19][20][21][22][23][24][25]. Yet it seems that they should be necessary present as, e. g., the hysteresis loops and ZFC -FC magnetization differences have the common origin.…”

Magnetic and anomalous magnetic viscosity in the bulk amorphous ferromagnet and partially amorphous ferromagnet

“…The model incorporates the idea of an 'inclusion grain', and requires knowledge of the temperature dependence of the intrinsic coercivity and saturation magnetisation. The model is closely related to the Preisach model, but differs in that the magnetic field near a grain is subject to fluctuations (a statistically fluctuating interaction field) from nearby grains [34]. The model has been applied with limited success to bulk amorphous alloys [19].…”