Disaccommodation of Amorphous Magnetic Alloy Fe_5Co_<70>Si_<10>B_<15>

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Time decrease of initial permeability μ_i after demagnetization (disaccommodation, DA) was measured for amorphous alloy Fe_5Co_<70>Si_<10>B_<15>. Two types in DA, named DA^I and DA^<II>, were observed. DA^I is a part of DA where μ_i recovers to the original value by demagnetization similarly to ordinary DA. In DA^<II;> μ_i does not recover by the demagnetization and continuously decreases, which seems to be a kind of ageing phenomenon. Magnitude of DA, D^I is 4 % between t_1=0.03 and t_2=4 minutes and D^<II> is 7% (t_2= 1 hour) at room temperature. Activation energy Q^I estimated from the thermal change of D^I is approximately 0.8 eV and Q^<II> is 1.5 eV. Annealing treatment at high temperature decreases both D^I and D^<II> to 1 %, increases Q^I to 1.1 eV and does not affect Q^<II>. It is concluded that the DA is due to the local induced anisotropy in 180° magnetic domain walls.
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1980-01-05