FMR study of the crystalline anisotropy of [Fe(t)Cr(38 Å)]N superlattices grown on MgO(100) and MgO(110)

Abstract

Using ferromagnetic resonance we measured the magnetocrystalline anisotropy (MA) of [Fe(t)Cr(38)]N superlattices with t: 5, 10, .14, 25, and 100Å, grown on MgO(100) and MgO(110) (SL100 and SL110, respectively). In the SL100 (SL110) series the effective demagnetization decreases due to a large surface MA of 0.19 ± 0.04 erg/cm2 (0.40 ± 0.05 erg/cm2). In SL100 the cubic MA, KC, approaches the bulk value for large t and decreases as 1/t. In SL110 we found a similar behavior of KC(t) which was not noted before as well as an uniaxial MA that increases as 1/t. The MA collapse for t = 5 Å, which we attribute to interface disorder. © 2001. Published by Elsevier Science B.V.