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Ferromagnetism at room temperature in ball-milled Al-1at.%Fe
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View Archive Info| Field | Value | |
| Title |
Ferromagnetism at room temperature in ball-milled Al-1at.%Fe
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| Creator |
Sebastian, Varkey
Suwalka, Om Prakash Lakshmi, N Venugopalan, K |
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| Subject |
Ball-milling
Fe-57 Mössbauer spectroscopy Quadrupole field distribution |
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| Description |
839-841
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. |
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| Date |
2008-12-26T09:41:29Z
2008-12-26T09:41:29Z 2007-10 |
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| Type |
Article
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| Identifier |
0019-5596
http://hdl.handle.net/123456789/2684 |
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| Language |
en_US
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| Relation |
G01J3/28, H01F41/30
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| Publisher |
CSIR
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| Source |
IJPAP Vol.45(10) [October 2007]
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