Abstract
An extensive Monte Carlo simulation is conducted to investigate a bilayer model of ferromagnet (FM)/amorphous magnet (AM). The random magnetic anisotropy (RMA) of the AM layer is demonstrated to be a new source for positive and negative exchange bias. Our simulated results show usual and unusual dependencies on cooling field, temperature, and RMA strength. These phenomena demand novel appropriate mechanisms to understand. Nevertheless, this FM/AM bilayer model opens a new avenue, other than those of FM/antiferromagnet and FM/spin glass bilayers, for magnetism of the exchange bias and for its applications. © 2010 American Institute of Physics.