Abstract
The coefficient of magnetic viscosity, S, of NdFeB alloys with varied intergrain exchange interaction constant, KIEI, was measured. The observed dependences of fluctuation field, Hf, on the applied field, H, are strongly correlated with KIEI value. Cooperative magnetization reversal of single domain interacting particles leads to improve the temperature stability of permanent magnets and magnetic systems based on them.
Highlights
Hard magnetic materials play an important role in modern technology and science developments in energy converters
With M(t) – magnetization depending on time t, M(0) – magnetization at t = 0 after a certain magnetic history of the sample, S – the coefficient of magnetic viscosity, t0 – some reference time depending on the measuring procedure
The first alloy is characterized by intergrain exchange interaction with the constant KIEI ~ 8 erg/cm2 [12]
Summary
Hard magnetic materials play an important role in modern technology and science developments in energy converters. The coefficient of magnetic viscosity, S, of NdFeB alloys with varied intergrain exchange interaction constant, KIEI, was measured. The field dependence of the irreversible part of the magnetic susceptibility, χirr, and of S are similar, with a maximum near the coercivity Hc [1].
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