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Magnetic properties of strontium hexaferrite films prepared by pulsed laser deposition |
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| Authors: | SM Masoudpanah SA Seyyed Ebrahimi CK Ong |
| Institution: | 1. Center of Excellence for Magnetic Materials, School of Metallurgy and Materials, College of Engineering, University of Tehran, Tehran, Iran;2. Center for Superconducting and Magnetic Materials, Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore |
| Abstract: | The magnetic properties of strontium hexaferrite (SrFe12O19) 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 Ms=298 emu/cm3 and Hc=2540 Oe. |
| Keywords: | Pulsed laser deposition Strontium hexaferrite film Pt(111) underlayer Perpendicular magnetic anisotropy Film thickness |
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