Torque magnetometry in YBa2Cu3O7-δ single crystals using high sensitive micromechanical torsional oscillator

Abstract

We have developed a high-sensitive micro-torsional oscillators and fabricated with a standard silicon process, as a platform to study the low temperatures magnetic properties of micron sized samples. When the oscillator-sample system interacts with a magnetic field, the displacement of the oscillator from its equilibrium position can be detected as a small change in the capacitance (≈ 0.001 pF). We use this device to study the magnetic response of a thick twinned YBa2Cu3O7−δ disk when the magnetic field is tilted away from the c axis in the temperature range 80 K < T < 100 K (Tc ≈ 92K).