Rare Earth Materials and Films Best Suited for Various Applications, Such as Lasers, Electro-Optic Sensors, and Magneto-Optic Devices

2014 ◽  
pp. 154-199
Keyword(s):  
Rare Earth ◽  
Electro Optic ◽  
Magneto Optic

Ion-Assisted Deposition of Protective Overlayers for Magneto-Optic Alloys

1988 ◽  
Vol 128 ◽  
Author(s):  
Kenneth D. Cornett ◽  
Ursula J. Gibson ◽  
Anthony Taylor
Keyword(s):  
Rare Earth ◽  
Data Storage ◽  
Optical Data Storage ◽  
Optical Data ◽  
Iron Films ◽  
Transition Metal Alloys ◽  
Refractory Oxides ◽  
Porous Microstructure ◽  
Data Storage Materials ◽  
Magneto Optic

ABSTRACTRare-Earth Transition-Metal alloys such as Tb-Fe-Co are being studied and used as magneto-optic data storage materials. These materials are susceptible to oxidation by either oxygen or water vapor, particularly the rare earth component. Pitting corrosion is also a problem when protective overlayers have pinholes or a porous microstructure. Both degradation mechanisms are significant for application of this material to optical data storage. We have used ion assisted deposition (IAD) to produce protective overlayers of refractory oxides, such as Al2O2 and ZrO2. These layers were deposited both with and without IAD onto iron films and exposed to environments with controlled temperature and humidity. A scanning micro-reflectometer capable of detecting micrometer-sized pinholes was used to monitor the degradation of the iron layer with exposure time.

Magneto-optic and luminescent properties of tellurite glass TeO2-ZnCl2 doped with rare-earth elements

2004 ◽  
Vol 77 (8) ◽  
pp. 1245-1248 ◽  
Author(s):  
I. A. Grishin ◽  
V. A. Gur?ev ◽  
E. B. Intyushin ◽  
Yu. E. Elliev ◽  
O. V. Pavlova ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Tellurite Glass ◽  
Luminescent Properties ◽  
Magneto Optic

Electro-Optic and Magneto-Optic Photonic Bandgap Materials Kevin

2004 ◽  
Vol 834 ◽  
Author(s):  
Y. Zou ◽  
Yanyun Wang ◽  
Kewen Li ◽  
Hua Jiang ◽  
Samir K. Mondal ◽  
...  
Keyword(s):  
Thin Film ◽  
Semiconductor Device ◽  
Photonic Bandgap ◽  
Organic Chemical ◽  
High Quality ◽  
Glass Substrates ◽  
Photonic Bandgap Materials ◽  
Electro Optic ◽  
Iron Garnet ◽  
Magneto Optic

ABSTRACTThis work presents a study of electro-optic and magneto-optic films made by a Metal-Organic Chemical Liquid Deposition (MOCLD) method. Electro-optic thin film, La-modified Pb(Mg1/3Nb2/3)O3-PbTiO3 (PLMNT) and magneto-optic thin film, rare earth doped yittrium iron garnet (YIG) have been grown at different conditions. Low temperature growth on buffered semiconductor substrates has been studied for semiconductor device integration. High quality PLMNT film with EO coefficient of 1x10-16 (m/V)2 was obtained with MOCLD. Doped and undoped YIG onto MgO and glass substrates and also onto buffered semiconductors were successfully deposited using MOCLD method. Several of these films had successful rotations that were of device quality. Based on these high quality functional films, two dimensional photonic bandgap waveguide structures were designed and simulated.

Faraday Effect Devices, Optical Isolators

1998 ◽  
Vol 517 ◽  
Author(s):  
Donald K. Wilson
Keyword(s):  
Rare Earth ◽  
Magnetic Fields ◽  
Faraday Effect ◽  
Fiber Optic ◽  
High Magnetic Fields ◽  
Laser Applications ◽  
Industrial Use ◽  
Critical Components ◽  
Optical Isolators ◽  
Magneto Optic

AbstractAlthough discovered over 150 years ago, it was not until the 1970's that materials were developed that enabled magneto-optic (Faraday) effect devices of practical sizes. These developments are: magneto-optic materials with high Verdet constants, and the rare-earth magnet materials, capable of extremely high magnetic fields.The magneto-optic effect has enabled development of equipment used in diverse laser applications, from industrial use to fiber-optic telecommunications.The principle of operation of optical isolators and circulators is described herein, as well as descriptions of critical components in such equipment, such as the polarizers and the magnets.

Amorphous Transition Metal-Rare Earth Alloy Films for Magneto-Optic Recording

1986 ◽  
Vol 80 ◽  
Author(s):  
Fred E. Luborsky
Keyword(s):  
Rare Earth ◽  
Transition Metal ◽  
Perpendicular Magnetic Anisotropy ◽  
Anisotropy Constant ◽  
Environmental Stability ◽  
Large Temperature ◽  
Kerr Rotation ◽  
Rare Earth Alloy ◽  
History Of ◽  
Magneto Optic

AbstractThis paper reviews the history of the development of films for use in magneto-optic recording. A discussion of why these early attempts with films of MnBi and Europium compounds were abandoned is given. The current work on amorphous transition metal-rare earth alloys is then reviewed. The origins of the necessary perpendicular magnetic anisotropy are discussed. The ideal combination of properties desired are: a high room temperature coercivity, a large temperature coefficient of coercivity, a large perpendicular anisotropy constant, large Ms, thermal and environmental stability, and, depending on whether a reflection or absorption mode of operation will be used, a large Kerr rotation with large reflectivity or a large Faraday rotation with a small specific absorption. These factors, their control, bow they influence the recording performance and the limits on performance of these amorphous films are discussed.

Characterizing the Magneto-optic Properties of Amorphous Rare Earth - Transition Metal Thin Films

1998 ◽  
Vol 517 ◽  
Author(s):  
W. A. Challener
Keyword(s):  
Thin Film ◽  
Rare Earth ◽  
Transition Metal ◽  
Figure Of Merit ◽  
Low Noise ◽  
Optical Recording ◽  
High Coercivity ◽  
Metal Thin Films ◽  
Mo Effect ◽  
Magneto Optic

AbstractThe amorphous rare earth - transition metal (RE-TM) thin film alloys and nanolayered materials exhibit numerous properties advantageous for optical recording, including perpendicular anisotropy, high coercivity and low magnetization at room temperature, low noise, and easily adjustable Curie and compensation points. As a result these materials have been employed in all commercial magneto-optic (MO) media. On the other hand, the MO effect of these materials is relatively small and tends to decrease with decreasing wavelength. It is important to understand the useful limits of these materials in MO media, and to determine if their MO figure of merit can be substantially increased through appropriate doping or nanolayering. In this paper we discuss experimental techniques for measuring MO properties, a theoretical approach for analyzing the data and designing optical thin film stacks, and results for a variety of RE-TM thin film materials.

MAGNETO-OPTIC KERR ROTATION OF RARE EARTH-IRON BASED ALLOYS

1994 ◽  
pp. 1011-1014
Author(s):  
Xiangyou Yu ◽  
Hideki Watabe ◽  
Satoshi Iwata ◽  
Shigeru Tsunashima ◽  
Susumu Uchiyama ◽  
...  
Keyword(s):  
Rare Earth ◽  
Kerr Rotation ◽  
Iron Based ◽  
Magneto Optic
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