Inverse exchange bias and training effect in Gd2Co0.5Mn1.5O6 with negative magnetization

The present experiments indicate that the phenomena of inverse exchange bias and negative magnetization are observed simultaneously in Gd(2)Co(0.5)Mn(1.5)O(6 )below the ferrimagnetic compensation point T-comp. The training effect confirms the intrinsic nature of the inverse exchange bias and reveals that the frozen spins relax more slowly than the rotatable spins according to the fitting of exchange bias field (H-EB) vs cycle loops (n) curve. The amplitude of H-EB varies inversely with the cooling field H-cool and the inverse exchange bias is found to remain up to 50 kOe. The observed exchange bias is argued to be due to the fact that the inverse ferromagnetic moments below T-comp can be flipped by adjusting the amplitude or direction of the magnetic field during the M(H) hysteresis loop measurement. The manipulability of the negative magnetization state is demonstrated by the remanent magnetization and magnetic switching measurements.

Automated summary

The present experiments show that inverse exchange bias and negative magnetization can be observed simultaneously in Gd(2)Co(0.5)Mn(1.5)O(6) below the ferrimagnetic compensation point T-comp. The slower relaxation of frozen spins compared to rotatable spins confirms the intrinsic nature of the inverse exchange bias. The amplitude of the exchange bias field (H-EB) is inversely proportional to the cooling field (H-cool), and the inverse exchange bias is observed up to 50 kOe. The observed exchange bias can be attributed to the flipping of inverse ferromagnetic moments below T-comp by adjusting the amplitude or direction of the applied magnetic field.