ABSTRACT
The author shows that spins react to a moderate applied magnetic field by creating a particular spin configuration along the c axis. He shows why some layers undergo a phase transition while others do not. The Green’s function method for non-collinear magnets is also carried out to investigate effects of quantum fluctuations. The author shows and discusses Non-uniform zero-point spin contractions and a crossover of layer magnetizations at low temperature. However, layers having large negative z spin-components (antiparallel to the field) can undergo a transition due to the magnetization reversal at a higher temperature similarly to an antiferromagnet in a field.
