The magnetocrystalline anisotropy constants of Ni and Fe have been determined at 77, 4.2, and 1.09 K from M⊥(ϑ) measurements above technical saturation. At 4.2 K and below the X2↓ hole band contribution is observed for H↘0 rotation in the (100) and (110) planes. Anisotropy constants, K1, K2, K3, and K4 determined for Ni and K1, K2, and K3 for Fe are compared with previous values from torque measurements. Second-order interdomain configurations transitions in M∥ versus H have been measured for H↘0 in a (100) plane of Ni. The angular dependence of the transition fields is in good agreement with the theory of Lawton and Stewart extended to include higher-order contributing anisotropy constants.
Magnetic field spot measurements were done at four distribution substations, three of them were of exactly the same design and capacity, while the fourth has similar design and half the capacity. The data collected were compared with one another. Taking into account loading of the substation during measurement period, it was found that magnetic field distributions were similar, with high peaks at low voltage cable connections to transformers and low-voltage switchgears. Magnetic fields decayed rapidly with distance. Magnetic field longitudinal and transverse linear plots crossing the middle of the substations were also constructed and these were also found to be similar. Magnetic field parameter plots give information of magnetic field of which the general public may likely be exposed to. These were found to be lower than the limit recommended by the most standards.
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