STRUCTURE AND MAGNETIC-PROPERTIES OF CO MN MULTILAYERS COMPOSED OF ULTRATHIN FILMS/

In multilayers of [Co(10 Angstrom)/Mn(t(Mn) Angstrom)](20) deposited o nto glass substrates under an ultra-high-vacuum (UHV), the saturation magnetic moment per Co, Ms(Co), is observed to increase with increasin g Mn thickness and eventually the magnetic moment to exceed that of bu lk Co. The saturation magnetic moment also varies depending upon the d eposition conditions of Mn-buffer layers, and magnetic moments are obs erved to be 1.5 to 2 times as large as that of bulk Co. This suggests that atomic layers of Mn adjacent to Co layers contribute ferromagneti cally to the magnetic moment by forming ferromagnetic coupling between Mn and Co atoms at their interfaces.