EP0186528B1 - Magnetisches Granatmaterial, magnetische Schicht mit starker Faraday-Rotation, welche solches Material enthält und Verfahren zu seiner Herstellung - Google Patents

Magnetisches Granatmaterial, magnetische Schicht mit starker Faraday-Rotation, welche solches Material enthält und Verfahren zu seiner Herstellung Download PDF

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EP0186528B1
EP0186528B1 EP85402075A EP85402075A EP0186528B1 EP 0186528 B1 EP0186528 B1 EP 0186528B1 EP 85402075 A EP85402075 A EP 85402075A EP 85402075 A EP85402075 A EP 85402075A EP 0186528 B1 EP0186528 B1 EP 0186528B1
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magnetic
oxide
magnetic material
film
accordance
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French (fr)
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EP0186528A1 (de
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Marie Françoise Armand
Jacques Daval
Bernard Ferrand
Hubert Moriceau
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Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F10/00—Thin magnetic films, e.g. of one-domain structure
    • H01F10/08—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers
    • H01F10/10—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition
    • H01F10/18—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition being compounds
    • H01F10/20—Ferrites
    • H01F10/24—Garnets
    • H01F10/245—Modifications for enhancing interaction with electromagnetic wave energy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/14—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates
    • H01F41/24—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates from liquids
    • H01F41/28—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates from liquids by liquid phase epitaxy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/90—Magnetic feature

Definitions

  • the subject of the present invention is a magnetic material of the garnet type, a Faraday magnetic film with high rotation comprising such a material and its manufacturing process.
  • the principle of such devices is to obtain a light contrast by using the Faraday effect induced on a monochromatic light when passing through a magnetic material.
  • a transparent monocrystalline substrate is used on which is deposited a thin monocrystalline layer of ferrimagnetic garnet in which the magnetization is normal to the plane, this layer is subdivided by etching into magnetic elementary cells whose magnetization can be oriented in a one way or the other.
  • These cells can thus be viewed in polarized light thanks to the Faraday effect: cells oriented in one direction will thus appear in clear, while cells oriented in the other direction will appear in dark.
  • this result is obtained by magnetic effect by selectively activating, in the presence of a polarization field, thin conductors deposited on the magnetic layer in two independent and perpendicular networks, surrounding the elementary magnetic cells.
  • the magnetic material used to produce the film must have very precise characteristics, but these are different depending on whether the thermomagnetic effect or the magnetic effect is used.
  • the reversal of the direction of magnetization is obtained by the application of a polarization field associated with a localized heating pulse on certain cells. Therefore, the material must have a compensation temperature close to ambient temperature so that the action of the applied external field is zero on the unheated cells, which occurs when one is in the vicinity of the compensation temperature. where the result of the magnetizations of the garnet sub-networks cancels out and nullifies the action of an external field.
  • the magnetic cells which will have been brought to a higher temperature, will see their magnetization align in the direction of the field applied simultaneously and one will thus obtain the reversal of the direction of the magnetization.
  • Magnetic garnets capable of meeting these characteristics correspond to composition (GdBi) 3 (FeGaAI) 5 0 12 .
  • the switching of these is done using currents flowing in crossed conductors in the presence of a polarization field.
  • the magnetic material used must have characteristics very different from those of materials using the thermomagnetic effect. In fact, this material must not have a compensation temperature close to ambient temperature, but it must have a low magnetization and a low anisotropy.
  • the use of the second technique proves to be particularly advantageous since it makes it possible to obtain much more quickly the reversal of the direction of magnetization of the magnetic cells, which constitutes an important advantage, in particular in display devices.
  • the present invention specifically relates to magnetic materials with high Faraday rotation, therefore with a high proportion of bismuth, capable of being used in devices using this second technique for switching magnetic cells.
  • the magnetic material according to the invention is characterized in that it corresponds to the formula: in which M represents either one or more rare earth elements chosen from lutetium, thulium and ytterbium, or yttrium, and xi, x 2 , y 1 and y 2 are such that: provided that y i and y 2 are not both equal to 0 and that y i + y 2 is at most equal to 1.
  • the magnetic material of the invention is thus a garnet of the Gd 2 Bii Fe 5 Oi 2 type in which part of the gadolinium has been replaced, on the one hand, by at least one element of the rare earths belonging to the lutetium group, thulium, ytterbium or by yttrium, and, on the other hand, by praseodymium, and in which part of the iron has been replaced by a non-magnetic element such as gallium and / or aluminum.
  • the presence either of at least one element of rare earths belonging to the group of lutetium, thulium, ytterbium, or of yttrium makes it possible to reduce the compensation temperature below the ambient temperature;
  • the presence of gallium and / or aluminum makes it possible to adjust the magnetization;
  • the presence of praseodymium makes it possible to adjust the uniaxial magnetic anisotropy field of the material to any value between 0 and 2 ⁇ 10 5 ⁇ A ⁇ m -1 , while retaining the optimized magneto-optical properties of the material due in particular to the presence of bismuth, gallium and / or aluminum, and one or more rare earths chosen from Lu, Tm, Yb or Y.
  • a single element of rare earths for example thulium, is used to decrease the compensation temperature.
  • rare earth elements chosen from Lu, Tm, Yb or Y
  • their respective contents (in atoms) in the material are such that the sum of these contents corresponds to x i .
  • a single element is generally used to adjust the magnetization. This can in particular be gallium, y 2 being equal to 0 in the formula given above.
  • Magnetic materials of this type can be obtained by epitaxy on a substrate. This makes it possible to obtain magnetic films with high Faraday rotation constituted by a thin monocrystalline layer of a magnetic material corresponding to the formula given above and by its non-magnetic monocrystalline substrate.
  • the substrate used for the epitaxy has practically the same crystal lattice constant as the magnetic material to be deposited.
  • the conventional technique for the deposition by epitaxy in the liquid phase of the layer, the conventional technique is used which consists in preparing an epitaxy bath from the oxides of the various constituents of the layer to be deposited, ie a bath containing gadolinium oxide, praseodymium oxide, at least one oxide of a metal M, bismuth oxide, iron oxide, gallium oxide and / or aluminum oxide and use is made a solvent for dissolving these different oxides.
  • This solvent can in particular be a mixture of lead oxide and boron oxide.
  • the quantities of the various oxides are such that they correspond to the composition of the layer which it is desired to deposit.
  • a substrate is then introduced into the bath by driving it in rotation and the deposition temperature Td is adjusted as a function of the saturation temperature Ts of the bath, in order to obtain the growth of a monocrystalline layer of desired composition.
  • the deposition temperature is generally 10 to 30 ° C lower than the saturation temperature.
  • the crucible is then introduced into an oven at 1000 ° C for several hours to melt the mixture, then it is subjected to stirring using a platinum stirrer and the temperature of the mixture is brought back to 950 ° C.
  • the stirring is continued mechanical for 4 h and after removing the agitator, the temperature of the bath is brought down as quickly as possible to 800 ° C.
  • a polished substrate is then introduced into the bath, of composition (Gd Ca) 3 (Ga Mg Zr) s O 12 oriented (111) having a diameter of 5.08 cm and a thickness of 500 ⁇ m, by dipping it horizontally in the bath and subjecting it to a rotational movement of 80 revolutions / minute.
  • the substrate-magnetic layer assembly is extracted from the bath without rotation, then it is subjected to an accelerated rotational movement up to 900 rpm to eject the remainder of the solvent by centrifugation, and it is taken out finally from the oven.
  • the epitaxial layer corresponds to the composition Bi 1 Gd 1.4 Tm 0.4 Pr 0.2 Fe 4.5 Ga 0.5 O 12 and its magnetic characteristics are given in the attached table. It also has a Faraday ⁇ f rotation of 1,750,000 ° / m measured at a wavelength of 632.8nm and an absorption a of 100,000 / m at this same wavelength.
  • the anisotropy constant Ku was determined from the following formula: in which H k represents the uniaxial anisotropy field and M s the saturation magnetic induction, in order to take account of the value of the saturation magnetic induction which can vary from one film to another.
  • the anisotropy constant of the film decreases sharply when the praseodymium content of the bath is increased and consequently the praseodymium content of the film.
  • the films obtained all have a Faraday rotation measured at 6328 A (632.8 nm) of approximately 17500 ° / cm.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Thin Magnetic Films (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Compounds Of Iron (AREA)

Claims (7)

1. Magnetisches Material, dadurch gekennzeichnet, daß es der Formel entspricht:
Figure imgb0024
worin M entweder ein oder mehrere Elemente der Seltenen Erden, ausgewählt aus Lutetium, Thulium und Ytterbium oder Yttrium darstellt und xi, x2, yi und y2 den Bedingungen genügen:
Figure imgb0025
Figure imgb0026
Figure imgb0027
Figure imgb0028
mit der Maßgabe, daß y1 und y2 nicht beide gleich 0 sind und y1 + y2 höchstens gleich 1 ist.
2. Magnetisches Material nach Anspruch 1, dadurch gekennzeichnet, daß M Thulium darstellt.
3. Magnetisches Material nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß y2 gleich 0 ist.
4. Magnetisches Material nach Anspruch 1, dadurch gekennzeichnet, daß es der Formel entspricht: Bi1Gd1,4Tm0,4Pro0,2Fe4,5Ga0.5O12
5. Magnetischer Film mit starker Faraday-Rotation, bestehend aus einem Substrat, das von einer epitaxialen Schicht aus einem magnetischen Material bedeckt ist, dadurch gekennzeichnet, daß es sich bei dem magnetischen Material um ein Material nach einem der Ansprüche 1 bis 4 handelt.
6. Film nach Anspruch 5, dadurch gekennzeichnet, daß das Substrat der Formel entspricht: Gd3-xCaxGa5-x-2yMgyZrx+yOi2 worin x und y den folgenden Bedingungen genügen:
0 < x ≤ 0,7
0 < y ≤ 0,7
x + y ≤ 0,8
7. Verfahren zur Herstellung eines magnetischen Films nach einem der Ansprüche 5 und 6 durch epitaxiale Ablagerung eines Granat-Films der nachstehend angegebenen Formel in flüssiger Phase auf einem Substrat:
Figure imgb0029
worin M entweder ein oder mehrere Elemente der Seltenen Erden, ausgewählt aus Lutetium, Thulium und Ytterbium oder Yttrium darstellt und bei dem man ein epitaxiales Bad verwendet, das enthält
1) Gadoliniumoxid,
2) Praseodymoxid,
3) mindestens ein Oxid eines Metalls M,
4) Wismutoxid,
5) Eisenoxid,
6) Galliumoxid und/oder Aluminiumoxid und
7) ein Lösungsmittel, das Bleioxid und Boroxid enthält,
dadurch gekennzeichnet, daß die Zusammensetzung des Bades so ist, daß die Molverhältnisse Fe203/Bi203, PbO/B1203 und PbO/B20s den folgenden Bedingungen genügen:
Figure imgb0030
Figure imgb0031
und
EP85402075A 1984-11-02 1985-10-25 Magnetisches Granatmaterial, magnetische Schicht mit starker Faraday-Rotation, welche solches Material enthält und Verfahren zu seiner Herstellung Expired EP0186528B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8416763 1984-11-02
FR8416763A FR2572844B1 (fr) 1984-11-02 1984-11-02 Materiau magnetique du type grenat, film magnetique a forte rotation faraday comportant un tel materiau et son procede de fabrication

Publications (2)

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EP0186528A1 EP0186528A1 (de) 1986-07-02
EP0186528B1 true EP0186528B1 (de) 1989-03-22

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US (1) US4698281A (de)
EP (1) EP0186528B1 (de)
JP (1) JPS61110408A (de)
DE (1) DE3569059D1 (de)
FR (1) FR2572844B1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5043231A (en) * 1988-11-04 1991-08-27 National Institute For Research In Inorganic Materials Gadolinium-lutetium-gallium garnet crystal, process for its production and substrate for magneto-optical device made thereof
JPH0782164B2 (ja) * 1991-04-25 1995-09-06 松下電器産業株式会社 磁気光学素子及び磁界測定装置
EP0522388A1 (de) * 1991-07-01 1993-01-13 Murata Manufacturing Co., Ltd. Geräte für magnetostatische Wellen
WO1995016269A1 (fr) * 1993-12-06 1995-06-15 Kirbitov, Viktor Mikhailovich Materiau ferromagnetique et son procede de production
US5925474A (en) * 1996-10-14 1999-07-20 Mitsubishi Gas Chemical Company, Inc. Bismuth-substituted rare earth iron garnet single crystal film
JP3649935B2 (ja) * 1999-03-15 2005-05-18 Ｔｄｋ株式会社 磁性ガーネット材料およびそれを用いたファラデー回転子
US7268946B2 (en) * 2003-02-10 2007-09-11 Jian Wang Universal broadband polarizer, devices incorporating same, and method of making same
JP5459243B2 (ja) * 2011-03-08 2014-04-02 住友金属鉱山株式会社 ビスマス置換型希土類鉄ガーネット結晶膜と光アイソレータ
CN113860367B (zh) * 2021-10-18 2023-03-28 安徽工业大学 一种氧化镨/氧化铋/镨酸铋复合纳米片及其合成方法

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Publication number Priority date Publication date Assignee Title
JPS5225000B2 (de) * 1972-08-11 1977-07-05
JPS49129700A (de) * 1973-04-18 1974-12-12
CA1050862A (en) * 1973-10-04 1979-03-20 Richard E. Novak Magnetic bubble devices and garnet films therefor
US3949386A (en) * 1973-11-12 1976-04-06 International Business Machines Corporation Bubble domain devices using garnet materials with single rare earth ion on all dodecahedral sites
JPS6011450B2 (ja) * 1976-10-08 1985-03-26 株式会社日立製作所 泡磁区素子用ガ−ネツト単結晶膜
FR2469477A1 (fr) * 1979-11-09 1981-05-22 Rhone Poulenc Ind Procede de fabrication de grenat polycristallin, grenat polycristallin et monocristal correspondant
FR2469478A1 (fr) * 1979-11-09 1981-05-22 Rhone Poulenc Ind Procede de fabrication de grenat polycristallin comportant l'aluminium et/ou le gallium et/ou l'indium et au moins un element pris dans le groupe constitue par les terres rares et l'yttrium, monocristaux correspondants
NL8004201A (nl) * 1980-07-22 1982-02-16 Philips Nv Inrichting voor de voortbeweging van magnetische domeinen.
US4647514A (en) * 1981-11-09 1987-03-03 At&T Bell Laboratories Magnetic domain device having a wide operational temperature range
JPS58153309A (ja) * 1982-03-05 1983-09-12 Hitachi Ltd イオン打込み素子用ガ−ネツト膜
US4433034A (en) * 1982-04-12 1984-02-21 Allied Corporation Magnetic bubble layer of thulium-containing garnet
JPS5972707A (ja) * 1982-10-20 1984-04-24 Hitachi Ltd 磁性ガーネット膜

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US4698281A (en) 1987-10-06
EP0186528A1 (de) 1986-07-02
FR2572844B1 (fr) 1986-12-26
FR2572844A1 (fr) 1986-05-09
JPS61110408A (ja) 1986-05-28
DE3569059D1 (en) 1989-04-27

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