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IJPAP Vol.45(10) [October 2007] >
| Title: | Ferromagnetism at room temperature in ball-milled Al-1at.%Fe |
| Authors: | Sebastian, Varkey
Suwalka, Om Prakash
Lakshmi, N
Venugopalan, K |
| Keywords: | Ball-milling
Fe-57 Mössbauer spectroscopy
Quadrupole field distribution |
| Issue Date: | Oct-2007 |
| Publisher: | CSIR |
| IPC Code: | G01J3/28, H01F41/30 |
| Abstract: | Iron nano particles have been embedded in an aluminium matrix through high energy ball milling. The Mössbauer spectrum of the as-milled sample at room temperature shows the presence of a magnetic hyperfine sextet, a paramagnetic singlet and a quadrupole doublet with relative areas of nearly 78, 16 and 6%, respectively. The value of the hyperfine field for the sextet corresponds to that of ⍺-Fe. The quadrupole component, which is indicative of formation of an Al-rich solid solution, is broad with a width of 0.73 mm/s indicating a distribution in the quadrupole fields. The value of the average splitting is 0.5mm/s and isomer shift (IS) equal to 0.49mm/s with respect to metallic iron. M-H measurements show that the unmilled system is non-magnetic while the milled system of 30 min is ferromagnetic and exhibits very soft magnetic properties. Unreacted Fe clusters embedded at the nano-crystalline Al grain boundaries seem to be responsible for the observed net magnetic moment. |
| Page(s): | 839-841 |
| ISSN: | 0019-5596 |
| Source: | IJPAP Vol.45(10) [October 2007]
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