The magnetoresistance of an Fe-Ni permalloy wire with a crossing Cu wire was investigated. In this system, the magnetic field produced by an electric current flowing in the Cu wire acts locally on a part of the Fe-Ni wire. The magnetization reversal of the Fe-Ni wire can be controlled by adjusting the strength and sense of the local field. The results are explained by a simple model which assumes that an effective magnetic field is a sum of the external and local magnetic fields.
Magnetic properties of ferromagnet-superconductor hybrid films have been investigated below and above the superconducting critical temperature. Below the superconducting critical temperature, the hybrid films show not only large coercive force but also hysteresis shift. These changes depend on the magnetic state in the ferromagnetic layer at the superconducting critical temperature. The magnetic properties of ferromagnet-superconductor hybrid films are interpreted from the viewpoint of the stray field due to the ferromagnetic layer and flux pinning in the superconducting layer. The magnetization process of ferromagnet-superconductor hybrid films is explained in terms of the critical state model for flux pinning in the superconducting layer.
In this paper, we propose a method for detecting cracks non-destructively by measuring the magnetic field around a distribution line. We report experimental and calculated results for the magnetic flux density around the distribution line, and consider the characteristics of the magnetic field distribution around the line. We present an algorithm with the parameter ΔLm for detecting the cracks, and consider the characteristics of the parameter Δ/Lm with respect to the current, the diameter of the leading wire, the radius of the circle of sensors, the number of sensors, and the depth of the crack.
A computer simulation of wall motion in domain wall displacement detection (DWDD) was performed using a micromagnetic model. The mechanism of the wall motion in the displacement layer and the effect of the track width and the defect of the track edge on the wall motion were investigated.