Moderate magnetic field induced large exchange bias effect in ferrimagnetic 314—Sr₃YCo₄O_10.5 material

Herein, we report the appearance of a large exchange bias effect in a moderate cooling field (cooling field, $H_{FC}=1$ kOe) for the 314—Sr₃YCo₄O_10.5 material. The exchange bias has started to appear near room temperature and reaches a maximum value of 5.5 kOe at 4 K. The existence of ferrimagnetic clusters in the compensated host in this layered structure originates the large exchange anisotropy. Remarkably, the observed value of moderate magnetic field induced exchange bias field is extremely large in comparison with material systems which are recognized to exhibit giant exchange bias effect. In combination with the feasibility of room temperature application, the appearance of large exchange bias in a moderate cooling field exemplifying the present material system as a promising class of compounds for designing coherent magnetic materials with huge exchange bias in low/moderate magnetic field. (paper)