Preparation of strontium hexaferrite film by pulsed laser deposition with in situ heating and post annealing |
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| Authors: | SM Masoudpanah SA Seyyed Ebrahimi CK Ong |
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| Affiliation: | 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 |
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| Abstract: | Strontium hexaferrite (SrFe12O19) films have been fabricated by pulsed laser deposition on Si(1 0 0) substrate with Pt(1 1 1) underlayer through in situ and post annealing heat treatments. C-axis perpendicular oriented SrFe12O19 films have been confirmed by X-ray diffraction patterns for both of the in situ heated and post annealed films. The cluster-like single domain structures are recognized by magnetic force microscopy. Higher coercivity in perpendicular direction than that for the in-plane direction shows that the films have perpendicular magnetic anisotropy. High perpendicular coercivity, around 3.8 kOe, has been achieved after post annealing at 500 °C. Higher coercivity of the post annealed SrFe12O19 films was found to be related to nanosized grain of about 50–80 nm. |
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| Keywords: | Strontium hexaferrite film Perpendicular magnetic anisotropy In situ heat treatment Post annealing heat treatment |
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