The microstructure of Nd–Fe, Co–Al

Magnetic properties and Mössbauer effect study of Nd60Fe30Al10 ribbons

“…Since the anomalies in the χ (T) curves show a characteristic shape of a cluster-like behavior [6], we have suggested that these anomalies can be related to Fe 1−x Al x alloys. However, the existence of these phases was not observed by means of high resolution electron microscopy measurements [4]. Instead, in [4], we found a precipitation of Nd-rich (Nd-Fe-Al) phases embedded in the amorphous matrix.…”

“…However, the existence of these phases was not observed by means of high resolution electron microscopy measurements [4]. Instead, in [4], we found a precipitation of Nd-rich (Nd-Fe-Al) phases embedded in the amorphous matrix. Hence, in the present work, we attempted once more to carry out a systematic study of the average HFD by means of Mössbauer spectroscopy, extending to annealed samples and also wheel side surface removed.…”

“…Later investigations revealed that the hard magnetic behavior can be influenced by the preparation method and quenching rate (QR). A precipitation of nanocrystalline Nd-rich phase embedded in the amorphous matrix exists even in those samples conventionally considered to be completely amorphous [2][3][4]. We found that the Curie temperature of the amorphous matrix T C is higher in the bulk material than in the ribbons.…”

“…However, for iH c (T) the magnetic relaxation is observed also for T < T m indicating that the magnetic after-effect is caused by the amorphous matrix. As the proportionality between H 1/2 c and T 2/3 is observed, we described the coercivity mechanism based on a model of strong pinning of the domain wall of the amorphous matrix [4]. Later, the existence of magnetic domains (with a size of around 300 nm) in the as-cast Nd 60 Fe 30 Al 10 has been proved [5].…”

“…3 are shown the HFD and MS measured at 295 K on the samples annealed at: (a) 603 K and removed surface of d = 9 m and (b) 653 K without surface removing. The method of the data analysis is given elsewhere [4]. The essential parameters derived from the computer fit are given in Table 1.…”