Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/2684
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
Series/Report no.: 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.
Description: 839-841
URI: http://hdl.handle.net/123456789/2684
ISSN: 0019-5596
Appears in Collections:IJPAP Vol.45(10) [October 2007]

Files in This Item:
File Description SizeFormat 
IJPAP 45(10) 839-841.pdf469.75 kBAdobe PDFView/Open


Items in NOPR are protected by copyright, with all rights reserved, unless otherwise indicated.