Search

A big enough transverse magnetic field applied in soft magnetic ferrite toroid can magnetize the ferrite to saturation in transverse direction and almost completely suppresses magnetic domain structures in the ferrite, the response to the longitudinal alternating electromagnetic field changes from the original domain wall displacements and spin rotations to the precession of magnetization around the transverse field and the hysteresis loss disappears in the ferrites. Both theoretical and experimental results indicate that the permeability and magnetic losses in the ferrite can be tuned by adjusting the transverse magnetic field. A higher Q value with relatively lower permeability can be achieved by increasing the transverse field, which ensures the ferrite can be operated at high frequencies with very low magnetic losses.

The magnetic phase diagram of rare-earth perovskite compound, GdScO3, has been investigated by magnetization and heat capacity. The system undergoes an antiferromagnetic phase transition at T N = 2.6 K, with an easy axis of magnetization along the a axis. The magnetization measurements show that it exists a spin-flop transition around 0.3 T for the applied field along the a axis. The critical magnetic field for the antiferromagnetic-to-paramagnetic transition is near 3.2 T when temperature approaches zero. By scaling susceptibilities, we presume this point (B = 3.2 T, T = 0 K) might be a field-induced quantum critical point and the magnetic critical fluctuations can even be felt above T N.