Magnetic susceptibility studies of single-crystalline zinc ferrites under pressure

Magnetic susceptibility measurements of magnetite and zinc ferrite (Fe3-xZnxO4, x = 0.0174, 0.049) single-crystal samples were performed under pressure up to 1.2 GPa in the temperature range close to the Verwey transition T-V. The application of pressure p decreases T-V linearly. The chi(AC) signal is not affected above T-V, but rises below T-V with p; this was explained by increasing domain wall movement. Finally, the isotropy point Tip increases with pressure indicating that magnetism does not actively participate in the Verwey transition. (c) 2005 Elsevier B.V. All rights reserved.