High sensitivity 2 T vibrating sample magnetometer

A new version of the vibrating sample magnetometer with a 2 T vertical axis superconducting magnet has been developed. The vertical vibration is made by a small superconducting magnet fed with an alternating current exerting a force on a magnet fixed on the sample rod. The latter, which is very ligh t (10-20 g), is centered by two CuBe springs so as to eliminate random fric tions. The sensitivity is 2.10(-7) emu. Any temperature between 1.5 and 300 K can be regulated within 0.01 K. The remanent field is about 10(-5) T. (C ) 1999 American Institute of Physics. [S0034-6748(99)03807-1].