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Title: Cooperative spin freezing and the pinning assisted thermoremanent magnetization in Ni{sub 2.04}Mn{sub 1.36}Sn{sub 0.6} alloy

Detailed investigation on the ground-state magnetic properties of Ni{sub 2.04}Mn{sub 1.36}Sn{sub 0.6} alloy is reported. The sample undergoes martensitic type structural transformation from a cubic austenite phase to an orthorhombic martensite phase on cooling around T{sub M} = 220 K. It orders ferromagnetically just above room temperature with T{sub C} = 310 K. The phases above and below T{sub M} are predominantly ferromagnetic, although incipient antiferromagnetic correlations have been mooted between the Mn atoms sitting at two different crystallographic sites. The zero-field-cooled magnetic state shows a step like anomaly around T{sub B} = 100 K, and the sample is found to show clear signature of spin glass like behaviour below this point. It is also associated with considerable exchange bias effect below T{sub B}, where horizontal shift of isothermal magnetization loop is observed in the field-cooled state. Apart from exchange bias, there exists large thermoremanent magnetization. Interestingly, the thermoremanent magnetization obtained by cooling the sample from above and just below the first order martensitic transition failed to show any sizable change, which rules out any major role of field induced arrest across the first order transition. The observed thermoremanent magnetization is presumably due to the effect of pinning of uncompensated spins in this magnetically inhomogeneous system with random ferromagneticmore » as well as antiferromagnetic bonds on field cooling through the onset point (T{sub B}) of the spin-glass like state.« less
Authors:
; ; ;  [1] ;  [2]
  1. Department of Solid State Physics, Indian Association for the Cultivation of Science, 2A and B Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032 (India)
  2. UGC-DAE Consortium for Scientific Research, Kolkata Centre, Sector III, LB-8, Salt Lake, Kolkata 700 098 (India)
Publication Date:
OSTI Identifier:
22314681
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 8; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANTIFERROMAGNETISM; AUSTENITE; COOLING; CRYSTALLOGRAPHY; FREEZING; GROUND STATES; MAGNETIC PROPERTIES; MAGNETIZATION; MARTENSITE; MARTENSITIC STEELS; ORTHORHOMBIC LATTICES; RANDOMNESS; SPIN; SPIN GLASS STATE; TEMPERATURE RANGE 0273-0400 K