Precise Magnetization Measurements by Parallel Self-Compensated Induction Coils in a Vertical Single-Turn Coil up to 103 T

We have developed a magnetization measurement technique for use in a vertically aligned single-turn coil. Compensation ratios of an order as high as 10(-4) were achieved by self-compensation in parallel twin-pickup coils without using the electronic compensation circuit mixing of the signal from an auxiliary coil. High performance cryogenics was employed with a liquid Helium container that was also manufactured to fit the system. The high-magnetic-field magnetization measurements were applied to a manganite Bi0.5Ca0.5MnO3 at room temperature, and also to a geometrically frustrated spinel oxide, CdCr2O4 at very low temperatures. Not only the transition field, but also the absolute value of the magnetization was shown to be evaluated within a 3% degree of accuracy in magnetic fields of up to 103 T by means of a 14-mm inner-diameter single-turn coil.