Won C, Wu Y Z, Scholl A, Doran A, Kurahashi N, Zhao H W, Qiu Z Q
Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
Phys Rev Lett. 2003 Oct 3;91(14):147202. doi: 10.1103/PhysRevLett.91.147202. Epub 2003 Sep 30.
Magnetic phase transitions in coupled magnetic sandwiches of Cu/Co/Cu/Ni/Cu(100) and Cu/Co/Fe/Ni/Cu(100) are investigated by photoemission electron microscopy. Element-specific magnetic domains are taken at room temperature to reveal the critical thickness at which the magnetic phase transition occurs. The results show that a coupled magnetic sandwich undergoes three types of magnetic phase transitions depending on the two ferromagnetic films' thickness. A phase diagram is constructed and explained in the process of constructing Monte Carlo simulations, which corroborate the experimental results.
