Header menu link for other important links
X
Observation of magnetic cluster phase above Curie temperature in Fe 2CrAl Heusler alloy
Published in
2012
Volume: 324
   
Issue: 7
Pages: 1296 - 1304
Abstract
We present a detailed magnetic critical behavior study of Fe 2CrAl Heusler alloy, for the first time, with rigorous analysis of high precision magnetization data obtained over the critical temperature region. Our studies confirm that B2 type site-disordered in Fe 2CrAl alloy exhibits long-range ferromagnetic order below a well defined Curie temperature (T=208 K). Though the nature of this transition is found to be of second order, the estimated critical exponents β=0.42, γ=1.356 and δ=4.25, are in between the theoretically predicted values for three-dimensional Heisenberg and mean-field interaction models. However, it is noteworthy that the scaling relations are obeyed indicating renormalization of interactions around the Curie temperature (T C), where magnetization data collapse into two separate branches, above and below T C. This conclusively shows that calculated critical exponents as well as critical temperature are unambiguous and intrinsic to the system. However, magnetization vs temperature data shows another magnetic transition (at T=313 K) above the Curie temperature. It is shown that the short range magnetic correlation exist even beyond T C with cluster moment ∼10 2 μ B. This is attributed to a site disorder which results in formation of Cr clusters with short range ferromagnetic order. © 2011 Elsevier B.V. All rights reserved.
About the journal
JournalJournal of Magnetism and Magnetic Materials
ISSN03048853
Open AccessNo
Concepts (29)
  •  related image
    Critical behavior
  •  related image
    Critical exponent
  •  related image
    CRITICAL TEMPERATURE REGION
  •  related image
    Critical temperatures
  •  related image
    FERROMAGNETIC ORDERS
  •  related image
    Heisenberg
  •  related image
    Heusler alloys
  •  related image
    High precision
  •  related image
    MAGNETIC CLUSTER
  •  related image
    Magnetic correlation
  •  related image
    Magnetic transitions
  •  related image
    Magnetization data
  •  related image
    MEAN-FIELD INTERACTIONS
  •  related image
    RENORMALIZATION
  •  related image
    Rigorous analysis
  •  related image
    Scaling relations
  •  related image
    Second orders
  •  related image
    SHORT-RANGE FERROMAGNETIC ORDER
  •  related image
    SITE DISORDER
  •  related image
    Temperature data
  •  related image
    Alloys
  •  related image
    Behavioral research
  •  related image
    Cerium alloys
  •  related image
    Curie temperature
  •  related image
    Ferromagnetic materials
  •  related image
    Ferromagnetism
  •  related image
    Magnetization
  •  related image
    Three dimensional
  •  related image
    Iron alloys