Open AccessIrreversible exchange-spring processes of antiferromagnetically exchange coupled hard-soft-hard trilayer structures
Author(s) -
郭光华,
张光富,
王希光
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.107503
Subject(s) - materials science , demagnetizing field , condensed matter physics , spring (device) , coupling (piping) , exchange bias , anisotropy , phase diagram , layer (electronics) , magnetic anisotropy , phase (matter) , composite material , magnetic field , thermodynamics , magnetization , chemistry , physics , optics , organic chemistry , quantum mechanics
The demagnetization processes of antiferromagnetically exchange-coupled hard-soft-hard trilayer structures are studied based on the one-dimensional atomic chain model. It is found that when the magnetic anisotropy of soft layer is taken into account, the change of the soft layer thickness or the interfacial exchange coupling strength may lead to a transition from the reversible exchange-spring process to the irreversible process. For the trilayer structures with very thin soft layer, the demagnetization process exhibits typical reversible magnetic exchange-spring behavior. However as the thickness of soft layer increases, there appears a crossover point tc, after which the process becomes irreversible. There occurs also a critical interfacial exchange constant Ashc, above which the exchange-spring process is reversible. When AshAshc, the irreversible exchange-spring process is realized. The phase diagrams of reversible and irreversible exchange-spring process are mapped in the plane of the interfacial exchange coupling Ash and soft layer thickness Ns. The dependences of the bending field on the soft layer thickness for different interfacial exchange couplings are numerically examined.