JP5172472B2 - ピンド層およびこれを用いたtmrセンサ並びにtmrセンサの製造方法 - Google Patents
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- G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
- G11B5/3906—Details related to the use of magnetic thin film layers or to their effects
- G11B5/3909—Arrangements using a magnetic tunnel junction
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- H01F10/324—Exchange coupling of magnetic film pairs via a very thin non-magnetic spacer, e.g. by exchange with conduction electrons of the spacer
- H01F10/3268—Exchange coupling of magnetic film pairs via a very thin non-magnetic spacer, e.g. by exchange with conduction electrons of the spacer the exchange coupling being asymmetric, e.g. by use of additional pinning, by using antiferromagnetic or ferromagnetic coupling interface, i.e. so-called spin-valve [SV] structure, e.g. NiFe/Cu/NiFe/FeMn
- H01F10/3272—Exchange coupling of magnetic film pairs via a very thin non-magnetic spacer, e.g. by exchange with conduction electrons of the spacer the exchange coupling being asymmetric, e.g. by use of additional pinning, by using antiferromagnetic or ferromagnetic coupling interface, i.e. so-called spin-valve [SV] structure, e.g. NiFe/Cu/NiFe/FeMn by use of anti-parallel coupled [APC] ferromagnetic layers, e.g. artificial ferrimagnets [AFI], artificial [AAF] or synthetic [SAF] anti-ferromagnets
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- 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
- H01F41/30—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 for applying nanostructures, e.g. by molecular beam epitaxy [MBE]
- H01F41/302—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 for applying nanostructures, e.g. by molecular beam epitaxy [MBE] for applying spin-exchange-coupled multilayers, e.g. nanostructured superlattices
- H01F41/303—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 for applying nanostructures, e.g. by molecular beam epitaxy [MBE] for applying spin-exchange-coupled multilayers, e.g. nanostructured superlattices with exchange coupling adjustment of magnetic film pairs, e.g. interface modifications by reduction, oxidation
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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
- H01F10/32—Spin-exchange-coupled multilayers, e.g. nanostructured superlattices
- H01F10/324—Exchange coupling of magnetic film pairs via a very thin non-magnetic spacer, e.g. by exchange with conduction electrons of the spacer
- H01F10/3254—Exchange coupling of magnetic film pairs via a very thin non-magnetic spacer, e.g. by exchange with conduction electrons of the spacer the spacer being semiconducting or insulating, e.g. for spin tunnel junction [STJ]
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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
- H01F10/32—Spin-exchange-coupled multilayers, e.g. nanostructured superlattices
- H01F10/324—Exchange coupling of magnetic film pairs via a very thin non-magnetic spacer, e.g. by exchange with conduction electrons of the spacer
- H01F10/3295—Spin-exchange coupled multilayers wherein the magnetic pinned or free layers are laminated without anti-parallel coupling within the pinned and free layers
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Description
Claims (21)
- 磁気抵抗効果素子におけるピンド層であって、
(a)反強磁性(AFM)層に接すると共に前記AFM層により磁化方向が固定された外側ピンド(AP2)層と、
(b)一面が前記AP2層上に形成された結合層と、
(c)前記結合層の、前記AP2層とは反対側に形成されると共に、前記AP2層の磁気モーメントと反平行方向の磁気モーメントを有する内側ピンド(AP1)層とを備え、前記AP1層は、少なくとも、
(1)CoFeB層またはCoFeB合金層、
(2)前記CoFeB層またはCoFeB合金層の上に形成されたFe層またはFe合金層、および、
(3)前記Fe層またはFe合金層の上に形成され、前記磁気抵抗効果素子におけるトンネルバリア層と接するCo層またはCo合金層
を有することを特徴とするピンド層。 - 前記磁気抵抗効果素子が、基板上に形成されたシード層と、前記シード層の上の前記AFM層と、前記トンネルバリア層の上に形成されたフリー層と、前記フリー層の上の保護層とを更に備えたトンネル磁気抵抗効果素子(TMR)センサであり、前記AP2層が前記AFM層に接している
ことを特徴とする請求項1に記載のピンド層。 - 前記CoFeB層またはCoFeB合金層の膜厚は1nm乃至8nm、前記Fe層またはFe合金層の膜厚は0.5nm乃至5nm、前記Co層またはCo合金層の膜厚は0.5nm乃至3nmである
ことを特徴とする請求項1に記載のピンド層。 - 前記CoFeB層が、Co(100-X-Y)FeXBYで表される組成を有し、前記組成におけるXが5原子%乃至95原子%であり、Yが5原子%乃至30原子%である
ことを特徴とする請求項1に記載のピンド層。 - 前記Fe合金層が、Co,NiまたはBを含むと共に少なくとも25原子%のFe含有量を有し、前記Co合金が、90原子%よりも多いCo含有量を有し、前記CoFeB合金がCoFeBMで表される組成を有し、前記組成におけるMがNi,Zr,Hf,Ta,Mo,Nb,Pt,Cr,Si,およびVからなる群から選択される1種以上である
ことを特徴とする請求項1に記載のピンド層。 - 前記AP1層が、前記結合層と前記CoFeB層またはCoFeB合金層との間にCoFe層を更に備えている
ことを特徴とする請求項1に記載のピンド層。 - 前記トンネルバリア層が、MgO,AlOx,TiOx,TiAlOxおよびMgZnOx、またはこれらの材料の組み合わせからなる
ことを特徴とする請求項1に記載のピンド層。 - 基板上にシード層、AFM層、ピンド層、トンネルバリア層、フリー層および保護層をこの順に備えたTMRセンサであって、
前記ピンド層は、
(a)前記AFM層の上に形成されると共に前記AFM層により磁化方向が固定された外側ピンド(AP2)層と、
(b)一面が前記AP2層上に形成された結合層と、
(c)前記結合層の、前記AP2層とは反対側に形成されると共に、前記AP2層の磁気モーメントと反平行方向の磁気モーメントを有する内側ピンド(AP1)層とを備え、前記AP1層は、少なくとも、
(1)CoFeB層またはCoFeB合金層、
(2)前記CoFeB層またはCoFeB合金層の上に形成されたFe層またはFe合金層、および、
(3)前記Fe層またはFe合金層の上に形成され、前記トンネルバリア層と接するCo層またはCo合金層
を有することを特徴とするTMRセンサ。 - 前記AP2層はCoFeからなり、前記結合層はRuからなり、前記AP1層は、1nm乃至8nmの膜厚に形成され、Co(100-X-Y)FeXBYで表される組成を有し、前記組成におけるXが5原子%乃至95原子%であり、Yが5原子%から30原子%であるCoFeB層を含むCoFeB/Fe/Coからなる構成を有し、前記Fe層が0.5nm乃至5nmの膜厚に形成され、前記コバルト層が0.5nm乃至3nmの膜厚に形成されている
ことを特徴とする請求項8に記載のTMRセンサ。 - 前記AP1層が、前記CoFeB層またはCoFeB合金層と前記結合層との間に形成されたCoFe層を更に含む
ことを特徴とする請求項8に記載のTMRセンサ。 - 前記Fe合金が、Co,NiまたはBを含むと共に少なくとも25原子%のFe含有量を有し、前記Co合金が、90原子%よりも多いCo含有量を有し、前記CoFeB合金がCoFeBMで表される組成を有し、前記組成におけるMがNi,Zr,Hf,Ta,Mo,Nb,Pt,Cr,Si,およびVからなる群から選択される1種以上である
ことを特徴とする請求項8に記載のTMRセンサ。 - 前記シード層がTa/Ruからなり、前記AFM層がIrMnからなり、前記トンネルバリア層がMgOを含み、前記フリー層はCoFe/NiFeからなり、前記保護層がTa/Ruからなる構成を有している
ことを特徴とする請求項8に記載のTMRセンサ。 - 前記トンネルバリア層が、Mg/MgO/Mgの積層構造を有する
ことを特徴とする請求項8に記載のTMRセンサ。 - ピンド層を有するTMRセンサの製造方法であって、
基板上にシード層、AFM層、ピンド層、トンネルバリア層、フリー層および保護層をこの順に形成する工程を含み、
前記ピンド層は、
(a)前記AFM層に接すると共に前記AFM層により磁化方向が固定された外側ピンド(AP2)層と、
(b)一面が前記AP2層上に形成された結合層と、
(c)前記結合層の、前記AP2層とは反対側に形成されると共に、前記AP2層の磁気モーメントと反平行方向の磁気モーメントを有する内側ピンド(AP1)層とを備え、前記AP1層は、少なくとも、
(1)CoFeB層またはCoFeB合金層、
(2)前記CoFeB層またはCoFeB合金層の上に形成されたFe層またはFe合金層、および
(3)前記Fe層またはFe合金層の上に形成され、トンネルバリア層と接しているCo層またはCo合金層
を有することを特徴とするTMRセンサの製造方法。 - 前記TMRセンサが、基板上に形成されたシード層と、前記シード層の上の前記AFM層と、前記トンネルバリア層の上に形成されたフリー層と、前記フリー層の上の保護層とを更に備え、前記AP2層が前記AFM層に接している
ことを特徴とする請求項14に記載のTMRセンサの製造方法。 - 前記AP1層のCoFeB層またはCoFeB合金層と前記結合層との間に、CoFe層を形成する工程
を含むことを特徴とする請求項14に記載のTMRセンサの製造方法。 - 前記CoFeBまたはCoFeB合金を、1nm乃至8nmの膜厚に形成すると共に、Co(100-X-Y)FeXBYで表される組成とし、その組成におけるXを5原子%ないし95原子%、Yを5原子%乃至30原子%とし、またはCoFeBMで表される組成とし、その組成におけるMをNi,Zr,Hf,Ta,Mo,Nb,Pt,Cr,Si,およびVからなる群から選択される1種以上とする
ことを特徴とする請求項14に記載のTMRセンサの製造方法。 - 前記Co層またはCo合金層を、0.5nm乃至3nmの膜厚に形成し、前記Co合金を、90原子%よりも多いCo含有量とし、前記Fe層またはFe合金層を、0.5nm乃至5nmの膜厚で形成し、前記Fe合金に、Co,NiまたはBを含めると共に、そのFe含有量を少なくとも25原子%とする
ことを特徴とする請求項14に記載のTMRセンサの製造方法。 - 前記ピンド層を含むTMRセンサを、240℃乃至340℃の温度でアニールする
ことを特徴とする請求項14に記載のTMRセンサの製造方法。 - 前記CoFeB層またはCoFeB合金層と前記Co層またはCo合金層との間に界面活性層を形成する工程、または前記Co層またはCo合金層と前記トンネルバリア層との間に界面活性層を形成する工程
を含むことを特徴とする請求項14に記載のTMRセンサの製造方法。 - 前記Co層またはCo合金層を形成する工程に先立ち、前記CoFeB層またはCoFeB合金層にプラズマ処理を施す工程、または前記トンネルバリア層を形成する工程に先立ち、前記Co層またはCo合金層にプラズマ処理を施す
ことを特徴とする請求項14に記載のTMRセンサの製造方法。
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US11/811,930 US7602033B2 (en) | 2007-05-29 | 2007-05-29 | Low resistance tunneling magnetoresistive sensor with composite inner pinned layer |
US11/811,930 | 2007-05-29 |
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