ALTERNATING CURRENT MAGNETIZATION RATE MEASURING INSTRUMENT

PURPOSE:To obtain data on an accurate magnetization rate depending upon the intensity of a magnetic field by incorporating an AC magnetic field application device composed of a bobbin and a coil in a constant-temperature tank and arranging a sample in a cooling tank which varies in temperature. CONSTITUTION:A measuring head is arranged on the gold stage of a refrigerating machine and surrounded with the cooling tank, and the AC magnetic field application device is supported. This application device consists of the coil 9 wound around the bobbin 8 and put in a case 14. This case consists of doughnut-shaped hollow cases 15 and 17, which form a vacuum tank 18 and the constant-temperature tank 19. The vacuum tank 18 operates as a heat insulating layer, the bobbin 8 and coil 9 are arranged in the constant-temperature tank 19, and the coil 9 does not vary in resistance at constant temperature. A superconducting material sample 10 is positioned in the center space of the case 15 and cooled below the critical temperature of superconduction in the cooling tank. Its measurement signal is led out of a port 22 for feeding electricity and leading a signal out. Thus, the coil 9 produces a constant magnetic field with an applied voltage and the data on the magnetization rate is obtained.