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Hysteresis, metastability, and time dependence in d = 2 and d = 3 random-field Ising systems

Journal Article · · J. Appl. Phys.; (United States)
DOI:https://doi.org/10.1063/1.335126· OSTI ID:5997577
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The hysteretic properties of random-field Ising model (RFIM) systems were studied. Using neutron scattering, a relatively narrow metastability boundary T/sub F/(H) in the d = 2 (d = d/sub l/) RFIM system Rb/sub 2/Co/sub 0.85/Mg/sub 0.15/F/sub 4/ was found to lie well below the rounded specific heat peak ''T/sub c/(H)'' of the (destroyed) phase transition. T/sub F/(H) scales as T/sub N/-T/sub F/(H)proportionalH/sup 2/phi/ with the RF crossover exponent phi = 1.74 +- 0.02. At T/sub F/(H), equilibrium is approached logarithmically with time. In the d = 3 (d>d/sub l/) RFIM system Fe/sub 0.6/Zn/sub 0.4/F/sub 2/ AF order was found to be stable against changes of T and H below the observed sharp phase transition boundary T/sub c/(H), while the field-cooled domain state was not. Capacitance measurements in Fe/sub 0.68/Zn/sub 0.32/F/sub 2/ established that equilibrium prevails for T > or = T/sub eq/(H) which is slightly above T/sub c/(H). Pronounced logarithmic time dependence is observed at T < or approx. =T/sub c/(H).
Research Organization:
Physics Department, University of California, Santa Cruz, California 95064 and Brookhaven National Laboratory, New York 11973
OSTI ID:
5997577
Journal Information:
J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 57:8; ISSN JAPIA
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALKALI METAL COMPOUNDS
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
CAPACITANCE
COBALT COMPOUNDS
COBALT FLUORIDES
COHERENT SCATTERING
COOLING
CRYSTAL MODELS
DIFFRACTION
DOMAIN STRUCTURE
ELECTRICAL PROPERTIES
ENERGY LEVELS
EXCITED STATES
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYSTERESIS
IRON COMPOUNDS
IRON FLUORIDES
ISING MODEL
MAGNETIC MATERIALS
MAGNETISM
MANGANESE COMPOUNDS
MANGANESE FLUORIDES
MANGANESE HALIDES
MATERIALS
MATHEMATICAL MODELS
METASTABLE STATES
NEUTRON DIFFRACTION
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RANDOMNESS
RUBIDIUM COMPOUNDS
RUBIDIUM FLUORIDES
SCATTERING
SPECIFIC HEAT
STABILITY
THERMODYNAMIC PROPERTIES
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS
ZINC FLUORIDES
ZINC HALIDES