Photo-induced magnetism of Pr 0.65 Ca 0.35 MnO 3 in powder and thin films
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Photo-induced magnetism of Pr0.65Ca0.35MnO3 in powder and thin films Takanobu Otagiri a, Masato Arai a, Masakazu Kodaira a, Osami Yanagisawa b, Mitsuru Izumi a a Laboratory of Applied Physics, Tokyo University of Marine Science and Technology 2-1-6 Etchu-jima, Koto-ku, Tokyo 135-8533, Japan b Yuge National College of Maritime Technology, 1000 Shimoyuge, Yuge-cho, Ochi-gun, Ehime 794-2593, Japan ABSTRACT The photo-induced magnetism was originally found in Pr0.65Ca0.35MnO3 powder by the ESR and x-ray diffraction studies. However, the mechanism of the photo-induce magnetism was under cover for a long time. Now, D.C. magnetization measurement under a near infrared pulsed laser irradiation (hν = 1.18 eV) reveals the mechanism. The D.C. magnetization prominently increases (approximately 6 %) under the laser irradiation, especially around 90 K near the canted antiferromagnetic (CAF) – antiferromagnetic (AF) transition. The result is consistent with the previous studies and indicates that a CAF – ferromagnetic transition is caused associating with the charge-order (CO) – charge-delocalize (CD) (insulator – metal) transition by the laser irradiation. As the second step for development, the thin films were prepared with the pellet of Pr0.65Ca0.35MnO3 in the on-axis and off-axis geometry of RF magnetron sputtering deposition. The off-axis geometry provides the Pr0.65Ca0.35MnO3 film same as powder composition and the on-axis sputtering fortunately provides the Pr0.99Ca0.01MnO3 film. Both films show photo-induced magnetism. The present photo-induced magnetism is coming from a spin-canted phase in both compounds. INTRODUCTION The photo-induced magnetism was reported in the distorted perovskite manganese, Pr0.65Ca0.35MnO3 powder in the charge-ordered (CO) state associated with the canted antiferromagnetic (CAF) spin order. The photo injection with near-infrared laser (hν = 1.17 eV) induces the magnetic and structural change as has been reported in the electron spin resonance (ESR) and the x-ray diffraction study [1 2 3]. However, the mechanism of photo-induce magnetism has been under cover for a long time. In this paper, the mechanism of photo-induced effect in the Pr0.65Ca0.35MnO3 powder under the laser irradiation is clarified by the D.C. magnetization measurement. As the second step for the application, Pr0.65Ca0.35MnO3 thin films were prepared with the on-axis and off-axis geometry in RF magnetron sputtering, which is known as a method that may give a thin film composition equal to that of the target. The off-axis RF magnetron sputtering deposition is respected less resputtering for deposited thin films. Influence of the sputtering geometry, and
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magnetic properties of the deposited thin films are investigated. Finally, the photo-induced magnetism is achieved in the thin film as confirmed by the D.C. magnetization. The fabrication of thin film provides the advantages to industrial application. The first reason is its ability to enhance the sensitivity of the photo-induced effect against small penetration dep
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