DocumentCode
67801
Title
Complex Magnetic Behavior of the Heusler Alloy—Cu2Mn0.75Fe0.25Al
Author
Venkateswarlu, Buchepalli ; Babu, P.D. ; Kumar, N. Hari
Author_Institution
Dept. of Phys., IIT Madras, Chennai, India
Volume
50
Issue
11
fYear
2014
fDate
Nov. 2014
Firstpage
1
Lastpage
4
Abstract
We investigated the structural and magnetic properties of Cu2Mn1-xFexAl (x = 0.25, 0.5, 0.75) alloys. Among the three compositions, only x = 0.25 composition crystallizes in single phase with L21 structure but its magnetic response indicates a complex magnetic structure. The magnetic isotherms were fitted to modified Langevin equation which indicates the presence of clusters with large magnetic moment. The ac susceptibility studies showed the presence of a superparamagnetic phase in the system over and above ferromagnetic order. To determine the nature of the interactions among the clusters, the variation of freezing temperature (Tf) with applied ac frequency was analyzed using different models (Néel-Arrhenius, Vogel-Fulcher, and critical slowing down model).
Keywords
aluminium alloys; copper alloys; crystal structure; crystallisation; ferromagnetic materials; iron alloys; magnetic moments; magnetic structure; magnetic susceptibility; manganese alloys; superparamagnetism; Cu2Mn0.75Fe0.25Al; Heusler alloy; L21 structure; Neel-Arrhenius model; Vogel-Fulcher model; ac susceptibility; complex magnetic structure; critical slowing down model; crystallization; ferromagnetic order; freezing temperature; magnetic isotherm; magnetic moment; magnetic properties; modified Langevin equation; structural properties; superparamagnetic phase; Magnetic hysteresis; Magnetic susceptibility; Magnetization; Metals; Saturation magnetization; Temperature; Temperature measurement; Full Heusler alloys; half-metallicity; spinglass; superparamagnetism;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/TMAG.2014.2323697
Filename
6971306
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