Magnetic properties of strontium hexaferrite films prepared by pulsed laser deposition

Abstract

The magnetic properties of strontium hexaferrite (SrFe 12O 19) films fabricated by pulsed laser deposition on the Si(100) substrate with Pt(111) underlayer have been studied as a function of film thickness (50-700 nm). X-ray diffraction patterns confirm that the films have c-axis perpendicular orientation. The coercivities in perpendicular direction are higher than those for in-plane direction which indicates the films have perpendicular magnetic anisotropy. The coercivity was found to decrease with increasing of thickness, due to the increasing of the grain size and relaxation in lattice strain. The 200 nm thick film exhibits hexagonal shape grains of 150 nm and optimum magnetic properties of M s=298 emu/cm 3 and H c=2540 Oe. © 2012 Elsevier B.V.