JP7538663B2 - スパッタリングターゲット、その製造方法、及び磁気記録媒体の製造方法 - Google Patents
スパッタリングターゲット、その製造方法、及び磁気記録媒体の製造方法 Download PDFInfo
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- JP7538663B2 JP7538663B2 JP2020148519A JP2020148519A JP7538663B2 JP 7538663 B2 JP7538663 B2 JP 7538663B2 JP 2020148519 A JP2020148519 A JP 2020148519A JP 2020148519 A JP2020148519 A JP 2020148519A JP 7538663 B2 JP7538663 B2 JP 7538663B2
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- 238000005477 sputtering target Methods 0.000 title claims description 79
- 238000004519 manufacturing process Methods 0.000 title claims description 25
- 239000000843 powder Substances 0.000 claims description 45
- 238000004544 sputter deposition Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 24
- 239000011812 mixed powder Substances 0.000 claims description 24
- 238000002441 X-ray diffraction Methods 0.000 claims description 23
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 21
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 16
- 238000005245 sintering Methods 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 4
- 230000001186 cumulative effect Effects 0.000 claims description 3
- 238000007561 laser diffraction method Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000000790 scattering method Methods 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 39
- 229910010271 silicon carbide Inorganic materials 0.000 description 38
- 239000010410 layer Substances 0.000 description 36
- 239000000395 magnesium oxide Substances 0.000 description 22
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 22
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 22
- 239000002994 raw material Substances 0.000 description 22
- 239000000203 mixture Substances 0.000 description 13
- 239000011777 magnesium Substances 0.000 description 12
- 239000010409 thin film Substances 0.000 description 11
- 239000010408 film Substances 0.000 description 10
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 238000007789 sealing Methods 0.000 description 7
- 229910052718 tin Inorganic materials 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 239000011241 protective layer Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- -1 Ta 2 O 5 Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 238000001636 atomic emission spectroscopy Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 238000001755 magnetron sputter deposition Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910005335 FePt Inorganic materials 0.000 description 1
- 229910019440 Mg(OH) Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910026551 ZrC Inorganic materials 0.000 description 1
- OTCHGXYCWNXDOA-UHFFFAOYSA-N [C].[Zr] Chemical compound [C].[Zr] OTCHGXYCWNXDOA-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N nickel(II) oxide Inorganic materials [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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Description
Si3N4、SiC、MgO、及びTiCNを含有し、比抵抗が10mΩ・cm以下であるスパッタリングターゲット。
[2]
X線回折における入射角(2θ)が41.8°~42.8°の間に存在するTiCNの結晶相を表す回折ピークの強度をITiCNとし、X線回折における入射角(2θ)が26.5°~27.5°の間に存在するSi3N4の結晶相を表す回折ピークの強度をISiNとすると、1.0≦ITiCN/ISiNを満たす[1]に記載のスパッタリングターゲット。
[3]
X線回折における入射角(2θ)が41.8°~42.8°の間に存在するTiCNの結晶相を表す回折ピークの強度をITiCNとし、X線回折における入射角(2θ)が37.6°~38.6°の間に存在するSiCの結晶相を表す回折ピークの強度をISiCとすると、10.0≦ITiCN/ISiCを満たす[1]又は[2]に記載のスパッタリングターゲット。
[4]
X線回折における入射角(2θ)が41.8°~42.8°の間に存在するTiCNの結晶相を表す回折ピークの強度をITiCNとし、X線回折における入射角(2θ)が37.6°~38.6°の間に存在するSiCの結晶相を表す回折ピークの強度をISiCとすると、5.0≦ITiCN/ISiCを満たす[2]に記載のスパッタリングターゲット。
[5]
X線回折における入射角(2θ)が20°~80°の間に存在する回折ピークのうち、2θが41.8°~42.8°の間に存在するTiCNの結晶相を表す回折ピークが最大強度を示す[1]~[3]の何れか一項に記載のスパッタリングターゲット。
[6]
Mgの元素濃度が0.5~2.0質量%である[1]~[5]の何れか一項に記載のスパッタリングターゲット。
[7]
相対密度が90%以上である[1]~[6]の何れか一項に記載のスパッタリングターゲット。
[8]
比抵抗が2mΩ・cm以下である[1]~[7]の何れか一項に記載のスパッタリングターゲット。
[9]
[1]~[8]の何れか一項に記載のスパッタリングターゲットを用いてスパッタすることを含む磁気記録媒体の製造方法。
[10]
前記スパッタはDCスパッタであることを含む[9]に記載の磁気記録媒体の製造方法。
[11]
Si3N4粉末、SiC粉末、MgO粉末、及びTiN粉末を混合して混合粉末を作製する工程と、
前記混合粉末を真空雰囲気又は不活性雰囲気下で加圧焼結法により焼結して焼結体を作製する工程と、
を含むスパッタリングターゲットの製造方法。
[12]
レーザー回折・散乱法に基づいて測定される体積基準の累積粒度分布において、前記混合粉末のメジアン径(D50)が0.5~5μmである[11]に記載のスパッタリングターゲットの製造方法。
[13]
前記混合粉末を焼結する際の保持温度が1700℃以上である[11]又は[12]に記載のスパッタリングターゲットの製造方法。
[14]
前記混合粉末は、Si3N4粉末を10~45mol%、SiC粉末を10~40mol%、MgO粉末を2~6mol%、及びTiN粉末を40~70mol%含有する[11]~[13]の何れか一項に記載のスパッタリングターゲットの製造方法。
本発明の一実施形態に係るスパッタリングターゲットは、窒化珪素(Si3N4)、炭化珪素(SiC)、酸化マグネシウム(MgO)、及び炭窒化チタン(TiCN)を含有する。これらの化合物は、スパッタ膜の導電性等の種々の性質を調整する役割を果たす。中でも、TiCNはSi3N4を含有するスパッタリングターゲット自体の比抵抗を低くするのに大きく寄与する。Ti、C及びNはそれぞれ磁気記録媒体の非磁性層を構成する元素として利用されてきた実績があることから、予期せぬ副作用を及ぼすことはないと推察される。理論によって本発明が限定されることを意図するものではないが、TiCNを含有することによりスパッタリングターゲットの比抵抗が低下する理由は以下のように推察される。TiCNは導電性材料であるため、ターゲット中に存在することにより、導電パスを形成し、比抵抗を低下させることができると考えられる。
スパッタリングターゲットの分析箇所:スパッタ面に対して垂直な切断面
X線源:Cu-Kα
管電圧:40kV
管電流:30mA
ゴニオメータ:試料水平型
スキャンスピード:10°/min
スキャンステップ:0.01°
測定範囲:2θ=20°~80°
バックグラウンド除去:フィッティング方式(簡易ピークサーチを行い、ピーク部分を取り除いた後、残りのデータに対して多項式をフィッティングする方式)
また、分析箇所は少なくとも#2000よりも細かい研磨剤を使用して研磨し、平坦かつ凹凸の少ない面を測定する。
本発明の一実施形態に係るスパッタリングターゲットは、例えば粉末焼結法を用いて製造することができ、その具体例としては以下のとおりである。
本発明の一実施形態に係るスパッタリングターゲットに対して、一般にはマグネトロンスパッタリング装置にてスパッタリングを行うことにより、所定の基板上又は他の膜上に成膜することで、スパッタ膜を得ることができる。本発明の一実施形態に係るスパッタリングターゲットは比抵抗が低いため、直流を用いたDCスパッタが可能である。
(1.スパッタリングターゲットの作製)
原料粉末として、Si3N4粉末(メジアン径:0.5μm)、SiC粉末(メジアン径:3μm)、MgO粉末(メジアン径:1μm)、及びTiN粉末(メジアン径:1.5μm)を用意した。これらの原料粉末のメジアン径は、株式会社堀場製作所製の型式LA-920の粒度分布測定装置を使用し、粉末をエタノールの溶媒中に分散させて湿式法にて測定した。屈折率は単一粉の場合はその構成成分に合う値を使用し、混合粉の場合は体積率の最も大きな構成成分の値を使用した。
上記の製造条件で作製した各スパッタリングターゲットについて、スパッタ面に対して垂直な切断面を鏡面研磨した。得られた研磨面に対してX線回折装置(株式会社リガク製UltimaIV)を使用して先述した測定条件でXRD分析を行った。バックグラウンド除去は、株式会社リガクの統合粉末X線解析ソフトウェアPDXL2の「フィッティングによるバックグラウンド除去」を採用した。これにより、入射角(2θ)が41.8°~42.8°の間に存在するTiCNの結晶相を表す回折ピークの強度(ITiCN)、入射角(2θ)が26.5°~27.5°の間に存在するSi3N4の結晶相を表す回折ピークの強度(ISiN)、入射角(2θ)が37.6°~38.6°の間に存在するSiCの結晶相を表す回折ピークの強度(ISiC)を求めた。また、入射角(2θ)が20°~80°の間に存在する回折ピークのうち、最大強度を示すピークの位置を特定し、当該ピークを示す化合物を同定した。結果を表3に示す。
上記の製造条件で作製した各スパッタリングターゲットについて、株式会社日立ハイテク製型式SPS5520によりICP発光分光分析法でMgの元素濃度を測定した。なお、ターゲット中のMgは原料中のMgO粉末に由来するため、Mgは実質的にすべてMgOの形態で存在していると考えられる。結果を表4に示す。
上記の製造条件で作製した各スパッタリングターゲットの相対密度を、先述した方法により測定した。例えば、実施例1の相対密度は、原料であるSi3N4、TiN、SiC及びMgOの分子量及び文献値密度を表1の値として、先述した計算式により求めた。結果を表4に示す。
上記の製造条件で作製した各スパッタリングターゲットについて、スパッタ面の比抵抗をエヌピイエス株式会社製抵抗率測定器型式FEEL-TC-100-SBを用いてJIS K7194:1994に従う四探針法(電気抵抗が1.0×106Ω以下の場合)で、又は日東精工アナリテック株式会社製ハイレスタ型式UX MCP-HT800を用いてJIS K6271-1:2015に基づく二重リング電極法(電気抵抗が1.0×106Ω超の場合)により求めた。結果を表4に示す。
上記の手順で作製した各スパッタリングターゲット部材を直径180mmのCu製のバッキングプレートにボンディングを行いDCスパッタ装置(キヤノンアネルバ株式会社製型式C-3010)に取り付け、スパッタリングを行った。スパッタリングの条件は、スパッタパワー:1kW、Arガス圧:1.7Paとした。放電できた場合は「可」、放電できなかった場合は「不可」と評価した。結果を表4に示す。
上記の知見に基づき得られる実施例3、4に係るスパッタリングターゲットについて記載する。実施例3、4のスパッタリングターゲットはそれぞれ、表2に記載の原料混合粉末組成とした他は、実施例1と同様の製造手順で製造可能である。実施例3、4のスパッタリングターゲットのXRD分析、Mg濃度、相対密度、比抵抗及びDCスパッタ可否を推定し、表3及び表4に示す。
Claims (13)
- Si3N4、SiC、MgO、及びTiCNを含有し、比抵抗が10mΩ・cm以下であるスパッタリングターゲット。
- X線回折における入射角(2θ)が41.8°~42.8°の間に存在するTiCNの結晶相を表す回折ピークの強度をITiCNとし、X線回折における入射角(2θ)が26.5°~27.5°の間に存在するSi3N4の結晶相を表す回折ピークの強度をISiNとすると、1.0≦ITiCN/ISiNを満たす請求項1に記載のスパッタリングターゲット。
- X線回折における入射角(2θ)が41.8°~42.8°の間に存在するTiCNの結晶相を表す回折ピークの強度をITiCNとし、X線回折における入射角(2θ)が37.6°~38.6°の間に存在するSiCの結晶相を表す回折ピークの強度をISiCとすると、10.0≦ITiCN/ISiCを満たす請求項1又は2に記載のスパッタリングターゲット。
- X線回折における入射角(2θ)が41.8°~42.8°の間に存在するTiCNの結晶相を表す回折ピークの強度をITiCNとし、X線回折における入射角(2θ)が37.6°~38.6°の間に存在するSiCの結晶相を表す回折ピークの強度をISiCとすると、5.0≦ITiCN/ISiCを満たす請求項2に記載のスパッタリングターゲット。
- X線回折における入射角(2θ)が20°~80°の間に存在する回折ピークのうち、2θが41.8°~42.8°の間に存在するTiCNの結晶相を表す回折ピークが最大強度を示す請求項1~3の何れか一項に記載のスパッタリングターゲット。
- Mgの元素濃度が0.5~2.0質量%である請求項1~5の何れか一項に記載のスパッタリングターゲット。
- 相対密度が90%以上である請求項1~6の何れか一項に記載のスパッタリングターゲット。
- 比抵抗が2mΩ・cm以下である請求項1~7の何れか一項に記載のスパッタリングターゲット。
- 請求項1~8の何れか一項に記載のスパッタリングターゲットを用いてスパッタすることを含む磁気記録媒体の製造方法。
- 前記スパッタはDCスパッタであることを含む請求項9に記載の磁気記録媒体の製造方法。
- Si3N4粉末、SiC粉末、MgO粉末、及びTiN粉末を混合して混合粉末を作製する工程と、
前記混合粉末を真空雰囲気又は不活性雰囲気下で加圧焼結法により焼結して焼結体を作製する工程と、
を含み、
前記混合粉末は、Si 3 N 4 粉末を10~45mol%、SiC粉末を10~40mol%、MgO粉末を2~6mol%、及びTiN粉末を40~70mol%含有する、スパッタリングターゲットの製造方法。 - レーザー回折・散乱法に基づいて測定される体積基準の累積粒度分布において、前記混合粉末のメジアン径(D50)が0.5~5μmである請求項11に記載のスパッタリングターゲットの製造方法。
- 前記混合粉末を焼結する際の保持温度が1700℃以上である請求項11又は12に記載のスパッタリングターゲットの製造方法。
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JP (1) | JP7538663B2 (ja) |
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JP2000313670A (ja) | 1999-04-26 | 2000-11-14 | Hitachi Metals Ltd | 窒化ケイ素焼結体およびそれからなるスパッタターゲット |
JP2018188714A (ja) | 2017-05-11 | 2018-11-29 | 三菱マテリアル株式会社 | スパッタリングターゲット |
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JPS61261815A (ja) * | 1985-05-15 | 1986-11-19 | Olympus Optical Co Ltd | 垂直磁気記録媒体 |
JPH0640522B2 (ja) * | 1985-10-23 | 1994-05-25 | 松下電器産業株式会社 | 薄膜抵抗体 |
JPH03183765A (ja) * | 1989-12-12 | 1991-08-09 | Hitachi Metals Ltd | 導電性サイアロンターゲット材 |
JPH05116152A (ja) | 1991-05-20 | 1993-05-14 | Sodick Co Ltd | セラミツクス製成形型 |
JPH07180031A (ja) * | 1991-11-26 | 1995-07-18 | Mitsui Mining & Smelting Co Ltd | サーマルヘッド用耐摩耗性保護膜 |
JPH05213674A (ja) * | 1992-01-31 | 1993-08-24 | Asahi Glass Co Ltd | セラミックス材料 |
JP3460504B2 (ja) * | 1997-04-21 | 2003-10-27 | 三菱マテリアル株式会社 | サイアロン膜形成用ターゲット材 |
JP2005353256A (ja) * | 2004-05-13 | 2005-12-22 | Fujitsu Ltd | 垂直磁気記録媒体およびその製造方法、磁気記憶装置 |
US7521137B2 (en) | 2005-01-12 | 2009-04-21 | Seagate Technology Llc | Patterned thin films and use of such films as thermal control layers in heat assisted magnetic recording media |
JP5256053B2 (ja) | 2009-01-15 | 2013-08-07 | 株式会社日立製作所 | 磁気記録媒体および磁気記録装置 |
US8399051B1 (en) | 2011-09-29 | 2013-03-19 | HGST Netherlands B.V. | Method for making a patterned perpendicular magnetic recording disk having a FePt or CoPt chemically ordered recording layer |
US8941950B2 (en) * | 2012-05-23 | 2015-01-27 | WD Media, LLC | Underlayers for heat assisted magnetic recording (HAMR) media |
JP6692724B2 (ja) * | 2016-09-02 | 2020-05-13 | Jx金属株式会社 | 非磁性材料分散型Fe−Pt系スパッタリングターゲット |
JP6977348B2 (ja) * | 2017-07-11 | 2021-12-08 | 三菱マテリアル株式会社 | スパッタリングターゲット、及びスパッタリングターゲットの製造方 |
JP6971901B2 (ja) * | 2018-03-27 | 2021-11-24 | Jx金属株式会社 | スパッタリングターゲット |
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- 2021-07-28 CN CN202180057713.XA patent/CN116134002A/zh active Pending
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Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2000313670A (ja) | 1999-04-26 | 2000-11-14 | Hitachi Metals Ltd | 窒化ケイ素焼結体およびそれからなるスパッタターゲット |
JP2018188714A (ja) | 2017-05-11 | 2018-11-29 | 三菱マテリアル株式会社 | スパッタリングターゲット |
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US12091743B2 (en) | 2024-09-17 |
CN116134002A (zh) | 2023-05-16 |
TW202210648A (zh) | 2022-03-16 |
WO2022049935A1 (ja) | 2022-03-10 |
US20230272521A1 (en) | 2023-08-31 |
JP2022042874A (ja) | 2022-03-15 |
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