JP2007281410A - 磁性材料並びにそれを用いたメモリーおよびセンサ - Google Patents
磁性材料並びにそれを用いたメモリーおよびセンサ Download PDFInfo
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- JP2007281410A JP2007281410A JP2006224954A JP2006224954A JP2007281410A JP 2007281410 A JP2007281410 A JP 2007281410A JP 2006224954 A JP2006224954 A JP 2006224954A JP 2006224954 A JP2006224954 A JP 2006224954A JP 2007281410 A JP2007281410 A JP 2007281410A
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- 239000000696 magnetic material Substances 0.000 title claims abstract description 64
- 230000015654 memory Effects 0.000 title claims abstract description 8
- 230000005291 magnetic effect Effects 0.000 claims abstract description 126
- 239000013078 crystal Substances 0.000 claims abstract description 45
- 230000008707 rearrangement Effects 0.000 claims abstract description 31
- 230000007704 transition Effects 0.000 claims abstract description 31
- 230000008859 change Effects 0.000 claims abstract description 16
- 239000002245 particle Substances 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 32
- 230000005415 magnetization Effects 0.000 claims description 22
- 239000010419 fine particle Substances 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 3
- 230000005381 magnetic domain Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 17
- 238000002441 X-ray diffraction Methods 0.000 abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 117
- 239000012071 phase Substances 0.000 description 38
- 239000000693 micelle Substances 0.000 description 33
- 239000000243 solution Substances 0.000 description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 20
- 238000010438 heat treatment Methods 0.000 description 14
- 239000000463 material Substances 0.000 description 13
- 238000005259 measurement Methods 0.000 description 13
- 239000000377 silicon dioxide Substances 0.000 description 10
- 235000014413 iron hydroxide Nutrition 0.000 description 9
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 9
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 8
- 239000000843 powder Substances 0.000 description 8
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 7
- 238000006467 substitution reaction Methods 0.000 description 7
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 239000002243 precursor Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 230000002441 reversible effect Effects 0.000 description 6
- 238000003980 solgel method Methods 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 239000004094 surface-active agent Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 239000008346 aqueous phase Substances 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 4
- SZQUEWJRBJDHSM-UHFFFAOYSA-N iron(3+);trinitrate;nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O SZQUEWJRBJDHSM-UHFFFAOYSA-N 0.000 description 4
- 239000006249 magnetic particle Substances 0.000 description 4
- 238000000634 powder X-ray diffraction Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000003917 TEM image Methods 0.000 description 3
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 3
- 150000001342 alkaline earth metals Chemical class 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- HVDZMISZAKTZFP-UHFFFAOYSA-N indium(3+) trinitrate trihydrate Chemical compound O.O.O.[In+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HVDZMISZAKTZFP-UHFFFAOYSA-N 0.000 description 3
- 235000013980 iron oxide Nutrition 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 230000002194 synthesizing effect Effects 0.000 description 3
- 239000011882 ultra-fine particle Substances 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Chemical compound [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910052712 strontium Inorganic materials 0.000 description 2
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- 241000238366 Cephalopoda Species 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- XURCIPRUUASYLR-UHFFFAOYSA-N Omeprazole sulfide Chemical compound N=1C2=CC(OC)=CC=C2NC=1SCC1=NC=C(C)C(OC)=C1C XURCIPRUUASYLR-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 241000219289 Silene Species 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- 229910001420 alkaline earth metal ion Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000005290 antiferromagnetic effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- LKRFCKCBYVZXTC-UHFFFAOYSA-N dinitrooxyindiganyl nitrate Chemical compound [In+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O LKRFCKCBYVZXTC-UHFFFAOYSA-N 0.000 description 1
- 239000003937 drug carrier Substances 0.000 description 1
- 230000005308 ferrimagnetism Effects 0.000 description 1
- 230000005307 ferromagnetism Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- IGUXCTSQIGAGSV-UHFFFAOYSA-K indium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[In+3] IGUXCTSQIGAGSV-UHFFFAOYSA-K 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000004093 laser heating Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 230000005408 paramagnetism Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000314 poly p-methyl styrene Polymers 0.000 description 1
- 229920003223 poly(pyromellitimide-1,4-diphenyl ether) Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 206010063401 primary progressive multiple sclerosis Diseases 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 150000004684 trihydrates Chemical class 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
- 229910003145 α-Fe2O3 Inorganic materials 0.000 description 1
- 229910006297 γ-Fe2O3 Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
- G11B5/70626—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances
- G11B5/70642—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y25/00—Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/714—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the dimension of the magnetic particles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/0036—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties showing low dimensional magnetism, i.e. spin rearrangements due to a restriction of dimensions, e.g. showing giant magnetoresistivity
- H01F1/0045—Zero dimensional, e.g. nanoparticles, soft nanoparticles for medical/biological use
- H01F1/0054—Coated nanoparticles, e.g. nanoparticles coated with organic surfactant
-
- 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
- H01F10/007—Thin magnetic films, e.g. of one-domain structure ultrathin or granular films
-
- 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
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/11—Magnetic recording head
-
- 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
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/11—Magnetic recording head
- Y10T428/115—Magnetic layer composition
-
- 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
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/32—Composite [nonstructural laminate] of inorganic material having metal-compound-containing layer and having defined magnetic layer
Landscapes
- Engineering & Computer Science (AREA)
- Nanotechnology (AREA)
- Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Inorganic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Hard Magnetic Materials (AREA)
- Compounds Of Iron (AREA)
- Magnetic Record Carriers (AREA)
Abstract
【解決手段】ε−Fe2O3結晶のFeサイトの一部がInで置換されたε−InxFe2-xO3〔ただし0<x≦0.30である〕の組成を有し、ε−Fe2O3の結晶構造と同様なX線回折パターンを示す(空間群が同じである)構造を有する結晶からなる磁性材料である。この磁性材料はInの含有量に応じて、ε−Fe2O3の磁気相転移温度よりも低い磁気相転移温度を有し、ε−Fe2O3のスピン再配列温度よりも高いスピン再配列温度を有する。また、この磁性材料はInの含有量に応じて、ε−Fe2O3が有する複素誘電率虚部のピーク温度よりも高い複素誘電率虚部のピーク温度を有する。
【選択図】図2
Description
(2)この磁性材料は常温付近の保磁力Hcが非常に高いので、磁気記録媒体の信頼性向上に寄与できる。
(3)この磁性材料は、鉄が3価まで酸化された酸化鉄からなるので、大気環境での耐食性が極めて良好である。メタル系磁性材料を使用している従来の光磁気記録媒体では耐酸化性が悪く、磁性層を窒化シリコン等の保護膜で覆うことが必須であったところ、本発明の磁性材料を使用すれば保護膜に耐食性を付与する機能を持たせる必要はほとんどなく、誘電体膜としての機能に特化した保護膜を選定することが可能になったり、あるいは保護膜のない媒体構造の構築が可能になったりすることが期待される。
(4)この磁性材料は、0℃より低温の温度域でスピン再配列を起こし、そのスピン再配列温度での磁気特性の変化がε−Fe2O3よりも急峻になる。また、このスピン再配列温度はInの含有量によって調整可能である。このため、本発明の磁性材料を使用すれば低温域での特定温度を境とした温度変化を鋭敏に検知する温度センサが構築できる。
本例はε−In0.12Fe1.88O3を合成した例である。
ミセル溶液Iとミセル溶液IIの二種類のミセル溶液を調整する。
・ミセル溶液Iの作製
テフロン(登録商標)製のフラスコに、純水6mL、n−オクタン18.3mLおよび1−ブタノール3.7mLを入れる。そこに、硝酸鉄(III)9水和物を0.00287モル、硝酸インジウム(III)3水和物を0.000135モルおよび硝酸バリウムを0.0003モル添加し、室温で良く撹拌しながら溶解させる。さらに、界面活性剤としての臭化セチルトリメチルアンモニウムを、純水/界面活性剤のモル比が30となるような量で添加し、撹拌により溶解させ、ミセル溶液Iを得る。
仕込み組成はε−In0.09Fe1.91O3である。
25%アンモニア水2mLを純水4mLに混ぜて撹拌し、その液に、さらにn−オクタン18.3mLと1−ブタノール3.7mLを加えてよく撹拌する。その溶液に、界面活性剤として臭化セチルトリメチルアンモニウムを、(純水+アンモニア中の水分)/界面活性剤のモル比が30となるような量で添加し、溶解させ、ミセル溶液IIを得る。
ミセル溶液Iをよく撹拌しながら、ミセルI溶液に対してミセル溶液IIを滴下する。滴下終了後、混合液を30分間撹拌しつづける。
手順2にで得られた混合液を撹拌しながら、当該混合液にテトラエトキシシラン1.5mLを加える。約1日そのまま、撹拌し続ける。
手順3で得られた溶液を遠心分離機にセットして遠心分離処理する。この処理で得られた沈殿物を回収する。回収された沈殿物をクロロホルムとメタノールの混合溶液を用いて複数回洗浄する。
手順4で得られた沈殿物を乾燥した後、大気雰囲気の炉内で1000℃で4時間の熱処理を施す。
手順5で得られた熱処理粉を2モル/LのNaOH水溶液1L中へ添加し、24時間撹拌し、粒子表面に存在するであろうシリカの除去処理を行う。次いで、ろ過・水洗し、乾燥する。
得られた試料を粉末X線回折(XRD:リガク製RINT2000、線源CuKα線、電圧40kV、電流30mA)に供したところ、図1の中段に示した回折パターンが得られた。この回折パターンは、上段のε−Fe2O3の結晶構造(斜方晶、空間群Pna21)のものとピークが対応している。格子定数を計算した結果、a軸=5.12Å、b軸=8.81Å、c軸=9.49Åであった。
本例は、ε−In0.18Fe1.82O3を合成した例である。
仕込み組成はε−In0.18Fe1.82O3である。
本例は、ε−Fe2O3を合成した例である。
本例は、ε−In0.19Fe1.81O3を合成した例である。
仕込み組成はε−In0.19Fe1.81O3である。
Claims (10)
- ε−Fe2O3結晶と空間群が同じであり、ε−Fe2O3結晶のFeサイトの一部がInで置換されたε−InxFe2-xO3〔ただし0<x≦0.30である〕の結晶からなる磁性材料。
- ε−Fe2O3の磁気相転移温度よりも低い磁気相転移温度を有する請求項1に記載の磁性材料。
- ε−Fe2O3のスピン再配列温度よりも高いスピン再配列温度を有する請求項1または2に記載の磁性材料。
- 単磁区構造の微細粒子からなる請求項1に記載の磁性材料。
- TEM写真により測定される長軸粒径が5〜200nmの範囲にある微細粒子からなる請求項1に記載の磁性材料。
- TEM写真により測定される長軸粒径が5〜200nmの範囲にある微細粒子からなる請求項1に記載の磁性材料を、支持体上に各粒子の位置を固定した状態で支持させた磁気記録媒体の磁性層。
- TEM写真により測定される長軸粒径が5〜200nmの範囲にある微細粒子からなる請求項1に記載の磁性材料を、各粒子結晶の磁化容易軸を所定の方向に配向して各粒子の位置を支持体上に固定した状態で支持させた磁気記録媒体の磁性層。
- ε−Fe2O3が有する複素誘電率虚部のピーク温度よりも高い複素誘電率虚部のピーク温度を有する請求項1に記載の磁性材料。
- 請求項1に記載の磁性材料の粒子を支持体上に固定してなる磁性層を有し、当該磁性材料を磁気相転移温度の高温側から低温側へ降温させる過程で磁化させることにより磁性層に情報を記録した磁気メモリー。
- 請求項1に記載の磁性材料と、その磁性材料の磁化の強さを測定する手段を有し、当該磁性材料がもつスピン再配列温度での磁気特性の急峻な温度依存性を利用して、当該スピン再配列温度を境とした温度変化を検知する温度センサ。
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