Production of pulse magnetic fields higher than 400 kOe and their applications to various magnetic measurements

Abstract

By using a condenser bank of the capacity 9000 μF and the working voltage 3.3 kV, magnetic fields higher than 400 kOe have been produced in a pulse form, the duration of which is about 1 ms. In order to avoid the mechanical breakdown of the coil, various types of coils including a toroidal transformer-type device have been constructed. Using these fields, various experiments have been performed. Magnetization parallel to the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</tex> axis (hard axis) of the Tb single crystal in the magnetic fields of 200 to 620 kOe at 77°K caused an appreciable lattice elongation parallel to the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</tex> axis, which resulted in an appearance of the local anisotropy with its hard axis perpendicular to the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</tex> axis. Measurements of the magnetoresistance effect of dilute alloys and the high field susceptibility of ferromagnets are also described.