tailieunhanh - Angle-dependent transmission for visible light of magnetic granular thin films

This investigation was carried out under an external magnetic field fixed at 4 kOe to ensure for all the Co-granule magnetization being kept in a fixed incident light propagating direction. Results showed a rather remarkable angular dependence of T(φ) on the Co content for different wavelengths. It was attributed the behavior of this to be dependent on the so-called magnonphoton interaction. | Journal of Science and Technology 54 (5A) (2016) 27-33 ANGLE-DEPENDENT TRANSMISSION FOR VISIBLE LIGHT OF MAGNETIC GRANULAR THIN FILMS Giap Van Cuong1, 2, Tran Trung2, Nguyen Anh Tuan1, * 1 International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology, 1 Dai Co Viet Road, Hai Ba Trung District, Hanoi, Vietnam 2 Hung Yen University of Technology and Education (UTEHY); Dan Tien, Khoai Chau, Hung Yen, Vietnam * Email: tuanna@ Received: 15/7/2016; Accepted for publication: 12 December 2016 ABSTRACT The transmission for visible light (T), with wavelengths from 560 to 695 nm, was investigated at various light incident angles of 0 ÷ 45 degree for the surface normal of samples (φ) as a function of Co contents for magnetic granular films Cox-(Al2O3)1-x, where x = ÷ . This investigation was carried out under an external magnetic field fixed at 4 kOe to ensure for all the Co-granule magnetization being kept in a fixed incident light propagating direction. Results showed a rather remarkable angular dependence of T(φ) on the Co content for different wavelengths. It was attributed the behavior of this to be dependent on the so-called magnonphoton interaction. Keywords: magnetic granular film, visible light, angle-dependent transmission, magnon-photon interaction. 1. INTRODUCTION Most of extraordinary behaviors from the optical electron manipulations have been recorded for noble metallic nanoparticles, such as Ag or Au, in which different plasmonic properties and modifiability or enhancement via nanoparticle resonance have been acquired [1–4]. Recently, it was predicted that one can perform an optical spin manipulation [5]. This prediction suggests a potential of considerable applications by acting optically on electronic spin. In recent years, magnon–photon coupling subject has gained interest [6] and has shown the potential to use new applications in quantum information [7, 8]. In this work, we report on some