The influence of applied tensile stress on power loss in Co-rich amorphous Co-Fe-Si-B ribbons with induced magnetic anisotropy

The influence on power loss P
T
of applied tensile stress σ in amorphous (Co
0.89
Fe
0.11
)
72
Mo
3
Si
15
B
10
(
\lambda_{s} > 0
) and Co
73
Mo
2
Si
15
B
10
(
\lambda_{s} < 0
) ribbons with different induced magnetic anisotropy K
u
is reported. The losses are measured under sinusoidal flux conditions at
f = 50
Hz,
J_{\max} = 0.57
T and at
f = 400
Hz,
J_{\max} = 0.10
T. Measurements are carried out on samples in a stress-relieved state and with magnetic anisotropies induced by stress or field annealing. At
f = 50
Hz, a minimum m P
t
versus σ is observed. The σ-value (
\sigma_{\min}
) corresponding to the minimum P
T
increases with increasing |K
u
|. At
f = 400
Hz, a minimum in P
T
versus σ is observed in the samples with induced magnetic anisotropy, whereas
\sigma_{\min} = 0
in the stress-relieved samiales. However, no correlation between and
\sigma_{\min}
and K
u
is possible from the present data.