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    • 36. 发明授权
    • Article comprising a magneto-optic material having low magnetic moment
    • 本文包括具有低磁矩的磁光材料
    • US5801875A
    • 1998-09-01
    • US653085
    • 1996-06-12
    • Charles David Brandle, Jr.Vincent Jerome FratelloSteven Joy Licht
    • Charles David Brandle, Jr.Vincent Jerome FratelloSteven Joy Licht
    • G02F1/09C30B29/28G02F1/00H01F10/24
    • H01F10/245G02F1/0036
    • Garnet material according to a particular embodiment of the invention exhibits a substantially rectangular magnetization loop, with .vertline.H.sub.S .vertline.>.vertline.4.pi.M.sub.S .vertline.Oe and .vertline.4.pi.M.sub.s .vertline. 500 Oe) at least at room temperature. Garnet materials according to the invention can advantageously be used in magneto-optic isolators and other magneto-optic devices. For instance, the material enables manufacture of isolators that do not contain a bias magnet. Garnet materials according to the invention generally contain at most relatively small amounts of Gd, Tb and Dy (less than 1.0, 2.1 and 2.5 atoms per formula unit, respectively; with Gd+(Tb/2.1)+(Dy/2.5)
    • 根据本发明的特定实施例的石榴石材料在预定的工作范围内(例如,-40°至+ 50°)表现出基本上矩形的磁化回路,其具有| HS | | | | | | | | | | | | | | | | | 80℃),其中HS是环路的开关磁场,4πMS是饱和磁化强度。 该材料具有改进的闭锁行为。 在本发明的另一个实施方案中,选择石榴石材料的组成使得该材料至少在室温下表现出硬的锁定行为(| Hs> 500Oe)。 根据本发明的石榴石材料可以有利地用于磁光隔离器和其它磁光器件中。 例如,该材料能够制造不含偏置磁体的隔离器。 根据本发明的石榴石材料通常含有至多相对少量的Gd,Tb和Dy(分别为每个式单元小于1.0,2.1和2.5个原子; Gd +(Tb / 2.1)+(Dy / 2.5)<1.0) ,通常含有Eu和/或Ho。 根据现有实践,根据本发明的组合物可以在例如室温下在工作温度范围内具有补偿温度。 根据本发明的示例性石榴石具有标称组成Bi0.75Eu1.5Ho0.75Fe4.1Ga0.9O12。
    • 40. 发明授权
    • Low saturated magnetic field bismuth-substituted rare earth iron garnet
single crystal and its use
    • 低饱和磁场铋取代稀土铁石榴石单晶及其应用
    • US5512193A
    • 1996-04-30
    • US447592
    • 1995-05-23
    • Kazushi ShiraiKenji IshikuraNorio Takeda
    • Kazushi ShiraiKenji IshikuraNorio Takeda
    • C30B19/02C30B29/22C30B29/28G02F1/09H01F10/24
    • H01F10/245C30B19/02C30B29/28
    • A bismuth-substituted rare earth iron garnet single crystal grown on a non-magnetic substrate having a lattice constant of 12.490 .ANG.-12.510 .ANG. by the liquid phase epitaxial method, and represented by a general equation:Gd.sub.x R.sub.y Bi.sub.3-x-y Fe.sub.5-z-w Ga.sub.z Al.sub.w O.sub.12where R denotes at least one element selected from the group consisting of yttrium (Y), ytterbium (Yb) and lutetium (Lu), and x, y, z and w are numerical values in the ranges 0.50.ltoreq.y/x.ltoreq.1.35, 1.40.ltoreq.x+y.ltoreq.1.90, 0.0.ltoreq.w/z.ltoreq.0.3 and 0.7.ltoreq.z+w.ltoreq.1.25. The magneto-optic optical switch or Faraday rotator constituted by the bismuth-constituted rare iron garnet is stably operable in a temperature range of -20.degree. C. to 60.degree. C. Because of the saturated magnetic field is 160 (Oe) or less, a magnetic field application device necessary to invert the magnetic field can be miniaturized.
    • 通过液相外延法在晶格常数为12.490 ANGSTROM -12.510 ANGSTROM的非磁性基板上生长的铋取代的稀土铁石榴石单晶,由通式如下:Gd x R y B i 3-x-y Fe 5-z-w Ga z Al w O 12 其中R表示选自钇(Y),镱(Yb)和镥(Lu)的至少一种元素,x,y,z和w是0.50≤y/ x < /=1,35,1.40,其中x = y = 1.90,0.0≤w/z≤0.3,0.7≤z+ w <1.25。 由铋构成的稀有铁石榴石构成的磁光光开关或法拉第旋转体在-20℃〜60℃的温度范围内稳定可操作。由于饱和磁场为160(Oe)以下, 能够使磁场反转所需的磁场施加装置小型化。