Anomalous composition dependences of the Curie temperature of the residual amorphous phase in nanocrystalline Fe92-xBxZr7Cu1 (2 ≤ x ≤ 23) alloys were studied by Mössbauer and magnetization measurements. The observed large (almost 300 K) increase with respect to that of the precursor amorphous phase at low B content is attributed to the volume effect. Mössbauer line broadening shows the presence of superparamagnetic relaxation of the bcc magnetization in nanocrystalline Fe74B18Zr7Cu1 well below the Curie temperature of the residual amorphous phase suggesting that interphase exchange coupling is weaker than the dipolar magnetic fields.
|Number of pages||4|
|Journal||Physica Status Solidi (A) Applied Research|
|Publication status||Published - Feb 2002|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics