Photo-Induced Magnetism in La_<0.5>Pr_<0.5>CrO_3 with Canted Antiferromagnetic Spin Order Studied by Electron Spin Resonance

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Photo-magnetic properties on the distorted perovskite chromates, La_<0.5>Pr_<0.5>CrO_3 (Space group : Pnma at 300 K) was studied by X-band (9.0GHz) Electron Spin Resonance (ESR). The La_<0.5>Pr_<0.5>CrO_3 shows the canted antiferromagnetic (CAF) transition at T_<CAF> 〜 261 K and the magnetic domains with random orientation of ferromagnetic component in the CAF spin order below the T_<CAF>. A YAG laser with photon energy hv=1.17 eV (wavelength λ=10640 Å) which is near infrared region was employed for a photo injection. During the photo injection, the ESR intensity increases dramatically around the T_<CAF>. The observed photo-induced ESR retain Lorentzian curvature with center resonance magnetic field, 320 mT. The photo-induced ESR intensity increase gradually with a increase in temperature up to the T_<CAF> i. e. the CAF state and grow up dramatically above the T_<CAF> i. e. the paramagnetic state. This high T_<CAF> allows us to provide photo-magnetic functional devices operated at room temperature. This transient magnetization was with the characteristic thermal activation energy of 130 meV. The present results open an intriguing possibility of collective photoinduced magnetism in the distorted perovskite chromates.
弓削商船高等専門学校の論文
2003-02-28