Applied Physics Letters · 1999 · 28 citations · 13 references
Natural SciencesMaterials EngineeringMaterials ScienceElectromagneticsElectromagnetismMagnetic MaterialsFerromagnetismMagnetic CharacterizationMagnetic DomainsMagnetic NanomaterialsMagnetic Properties Of SolidsMagnetization ProcessesCoercivityCoercivity EnhancementDynamic ScalingKerr MicroscopyMagnetic CoercivityMagnetic Domain StructureMagnetic HysteresisSize-dependent Magnetic Properties
The scaling of the magnetic hysteresis loop area of permalloy disks (20–400 μm diam) has been studied as a function of applied field amplitude H0 and frequency Ω using scanning Kerr microscopy. An increase in the dynamic coercivity with reduced size is observed for d<100 μm in the frequency range studied (0.1–800 Hz). However, the loop area A follows the scaling relation A∝H0αΩβ, with α≈0.14 and β≈0.50 throughout the entire size range studied. Our results demonstrate that the dynamic scaling behavior is universal even though the lateral size influences the domain structure and magnetic reversal behavior.
13