OSCILLATORY INTERLAYER MAGNETIC COUPLING IN MAGNETIC SANDWICHES AND SUPERLATTICES

Based on rigorous results for both the antiferromagnetic Heisenberg mo del and the Hubbard model, we construct some layered crystal lattices, and show rigorously that the interlayer magnetic coupling (IMC) betwe en magnetic layers separated by a non-magnetic or antiferromagnetic sp acer is oscillatory with a period of two monolayers in the interlayer, and independent of the magnetic layer thickness. Our findings provide a possible way to find or construct some magnetic superlattices as we ll as to understand the mechanism of the IMC.