JP2007142424A - トンネルバリア層の形成方法、ならびにtmrセンサおよびその製造方法 - Google Patents
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- 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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- 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
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- Y10T428/1107—Magnetoresistive
- Y10T428/1143—Magnetoresistive with defined structural feature
Abstract
【解決手段】 TMRセンサのトンネルバリア層28を、下部Mg層25/MgO層26/上部Mg層27という3層積層構造にする。MgO層26は、下部Mg層25の表面を自然酸化させて形成する。このため、膜厚と酸化状態の均一性が改善される。また、上部Mg層27を追加したことで、隣接するフリー層29の酸化を防止できる。AlOX からなるトンネルバリア層を備えた従来のTMRセンサと比べて、低いRA値であっても高いMR比が得られる。
【選択図】 図1
Description
なお、実際の磁気ヘッドにおいては、再生ヘッドの他に記録ヘッドをも搭載した記録再生ヘッドとして構成する場合が多い。この場合には、上記第2のギャップ層を介して記録ヘッド部分(図示せず)を積層形成し、ウェハ段階での薄膜プロセスを終了する。さらに、この薄膜形成の終了したウェハ構造体から、再生ヘッドおよび記録ヘッドを含むヘッドスライダを切り出し、エアベアリング面を研磨形成することにより、磁気記録再生ヘッドの製造工程の主たる部分が完了する。
Mg/MgO/Mgという3層構造のトンネルバリア層を備えたTMRセンサを実際に作製し、改善された性能を検証する試験を行った。具体的には、上記した実施の形態にしたがって、Ta(2)/Ru(2)/IrMn(7)/CoFe(1.9)/Ru(0.75)/Fe56Co24B20(2)/Mg/MgO/Mg/CoFe(1)/NiFe(4)/Ru(1)/Ta(6)という積層構造のTMR積層体31を作製した。ここで、括弧内の数値は膜厚(nm)を示す。
Claims (21)
- TMRセンサにおけるトンネルバリア層を形成する方法であって、
強磁性層の上に第1のマグネシウム層を形成するステップと、
前記第1のマグネシウム層を自然酸化させて、その上に酸化マグネシウム層(MgO)を形成するステップと、
前記酸化マグネシウム層の上に第2のマグネシウム層を形成するステップと
を含むことを特徴とするトンネルバリア層の形成方法。 - 前記強磁性層は第1の強磁性層であり、
第2のマグネシウム層の上に第2の強磁性層を形成するステップをさらに含むことを特徴とする請求項1に記載のトンネルバリア層の形成方法。 - 前記第1および第2のマグネシウム層ならびに前記第1および第2の強磁性層を、スパッタリングシステムの1または複数のチャンバ内において直流スパッタリングにより形成する
ことを特徴とする請求項2に記載のトンネルバリア層の形成方法。 - 前記第1のマグネシウム層を自然酸化させて酸化マグネシウム層を形成するステップを、スパッタリングシステムの前記1または複数のチャンバとは異なる酸化用チャンバ内で行う
ことを特徴とする請求項3に記載のトンネルバリア層の形成方法。 - 前記第1のマグネシウム層を自然酸化させて酸化マグネシウム層を形成するステップを、13.3mPaから133mPaの酸素圧下の酸化用チャンバ内で15秒から300秒間行う
ことを特徴とする請求項1に記載のトンネルバリア層の形成方法。 - 前記第1のマグネシウム層の膜厚を0.4nmから1.4nmとし、前記第2のマグネシウム層の膜厚を0.2nmから0.8nmとする
ことを特徴とする請求項1に記載のトンネルバリア層の形成方法。 - シード層、反強磁性層、ピンド層、前記トンネルバリア層、フリー層およびキャップ層を順に含む積層構造を有するように前記TMRセンサを磁気再生ヘッドの下部シールド層の上に形成する
ことを特徴とする請求項1に記載のトンネルバリア層の形成方法。 - 前記強磁性層が、AP2/Ru/AP1からなる積層構造を有するシンセティック反平行(SyAP)ピンド層であり(但し、AP2層はコバルト鉄(CoFe)からなり、AP1層は膜厚が1nmから8nmのコバルト鉄ボロン(Co1-X-Y FeX BY ;X=5〜95原子%,Y=5〜30原子%)層である)、
前記第1のマグネシウム層を前記シンセティック反平行ピンド層の上に形成する
ことを特徴とする請求項1に記載のトンネルバリア層の形成方法。 - 前記フリー層を、コバルト鉄/ニッケル鉄(Co1-W FeW /Ni1-Z FeZ ;W=10〜90原子%、Z=5〜70原子%)からなる積層膜、または、コバルト、鉄、ニッケルおよびボロンのうちの少なくとも2つを含む合金多層膜として形成する
ことを特徴とする請求項7に記載のトンネルバリア層の形成方法。 - 前記シード層を、タンタル(Ta)/ルテニウム(Ru),タンタル,タンタル/ニッケルクロム(Ta/NiCr),タンタル/銅(Cu),またはタンタル/クロムからなるように形成し、
前記反強磁性層を、イリジウム(Ir)/マンガン(Mn),白金マンガン(MnPt),ニッケルマンガン(NiMn),オスミウムマンガン(OsMn),ルテニウムマンガン(RuMn),ロジウムマンガン(RhMn),パラジウムマンガン(PdMn),ルテニウムロジウムマンガン(RuRhMn),または白金マンガンパラジウム(MnPtPd)のうちのいずれかからなるように形成する
ことを特徴とする請求項7に記載のトンネルバリア層の形成方法。 - 磁気デバイスにおけるTMRセンサを製造する方法であって、
強磁性層の上に第1のマグネシウム層を形成するステップと、
前記第1のマグネシウム層の上に酸化マグネシウム層を形成するステップと、
前記酸化マグネシウム層の上に第2のマグネシウム層を形成するステップと
を含み、これにより、第1のマグネシウム層/酸化マグネシウム層/第2のマグネシウム層からなる3層構造のトンネルバリア層を形成する
ことを特徴とするTMRセンサの製造方法。 - 前記酸化マグネシウム層を高周波スパッタリングまたは反応性スパッタリングにより形成する
ことを特徴とする請求項11に記載のTMRセンサの製造方法。 - 13.3mPaから133mPaの酸素圧下で15秒から300秒の間、前記第1のマグネシウム層を部分的に自然酸化させることにより、前記酸化マグネシウム層を形成する ことを特徴とする請求項11に記載のTMRセンサの製造方法。
- 前記強磁性層、ならびに前記第1および第2のマグネシウム層を、直流スパッタリングにより形成する
ことを特徴とする請求項11に記載のTMRセンサの製造方法。 - 磁気デバイスにおけるTMRセンサであって、
強磁性層と、
前記強磁性層の上に順に下部マグネシウム層、中間の酸化マグネシウム層および上部マグネシウム層を積層して形成された3層構造を含むトンネルバリア層と
を備えたことを特徴とするTMRセンサ。 - 前記強磁性層が、AP2/Ru/AP1なる積層構造を有するシンセティック反平行ピンド層であり(但し、AP2層はコバルト鉄(CoFe)からなり、AP1層はコバルト鉄ボロン(Co1-X-Y FeX BY ;X=5〜95原子%,Y=5〜30原子%)を含む膜厚が1nmから8nmの層である。)、
前記上部マグネシウム層の上にフリー層が設けられている
ことを特徴とする請求項15に記載のTMRセンサ。 - 前記強磁性層が、AP2/Ru/AP1なる積層構造を有するシンセティック反平行ピンド層である(但し、AP2層はコバルト鉄(CoFe)からなり、AP1層はコバルト鉄ボロン(CoFeB)層と、膜厚が0.5nmから2nmのコバルト鉄(Co1-V FeV ;V=10〜90原子%)層とからなる)
ことを特徴とする請求項15に記載のTMRセンサ。 - 前記フリー層は、コバルト鉄/ニッケル鉄(Co1-W FeW /Ni1-Z FeZ ;W=10〜90原子%、Z=5〜70原子%)からなる積層膜、または、コバルト、鉄、ニッケルおよびボロンのうちの少なくとも2つを含む合金多層膜である
ことを特徴とする請求項16に記載のTMRセンサ。 - 前記下部マグネシウム層は0.4nmから1.4nmの膜厚を有し、前記上部マグネシウム層は0.2nmから0.8nmの膜厚を有する
ことを特徴とする請求項15に記載のTMRセンサ。 - 前記酸化マグネシウム層の膜厚が、34%以上のMR比と、2Ω・μm2 以上のRA値(面積抵抗値)とを発現するように調整されている
ことを特徴とする請求項15に記載のTMRセンサ。 - 前記磁気デバイスは、MRAMまたは磁気再生ヘッドであり、
タンタル/ルテニウムからなるシード層と、イリジウムマンガンからなる反強磁性層と、コバルト鉄/ルテニウム/コバルト鉄ボロンからなる強磁性ピンド層と、前記トンネルバリア層と、コバルト鉄/ニッケル鉄からなるフリー層と、キャップ層とを基板上に順に積層してなるボトム型スピンバルブとして構成されている
ことを特徴とする請求項15に記載のTMRセンサ。
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Cited By (21)
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JP2008047757A (ja) * | 2006-08-18 | 2008-02-28 | Fujitsu Ltd | Tmr素子 |
JP2008078379A (ja) * | 2006-09-21 | 2008-04-03 | Alps Electric Co Ltd | トンネル型磁気検出素子の製造方法 |
JP2009027177A (ja) * | 2007-07-23 | 2009-02-05 | Magic Technologies Inc | Stt−mtj−mramセルおよびその製造方法 |
JP2009054880A (ja) * | 2007-08-28 | 2009-03-12 | Toshiba Corp | スピンfet及び磁気抵抗効果素子 |
JP2009111396A (ja) * | 2007-10-31 | 2009-05-21 | Magic Technologies Inc | 磁気トンネル接合素子、mram、stt−ram、mramの製造方法、stt−ramの製造方法 |
JP2009117846A (ja) * | 2007-11-08 | 2009-05-28 | Headway Technologies Inc | Tmr素子およびその形成方法 |
JP2009194398A (ja) * | 2009-05-25 | 2009-08-27 | Toshiba Corp | 磁気抵抗効果素子、及び磁気抵抗効果素子を備えた磁気記憶装置 |
JP2009253303A (ja) * | 2008-04-09 | 2009-10-29 | Magic Technologies Inc | Mtj素子およびその形成方法、stt−ramの製造方法 |
WO2009157064A1 (ja) * | 2008-06-25 | 2009-12-30 | キヤノンアネルバ株式会社 | トンネル磁気抵抗素子の製造方法および製造装置 |
JP2010021291A (ja) * | 2008-07-09 | 2010-01-28 | Tdk Corp | スピンfet |
JP2010074170A (ja) * | 2008-09-22 | 2010-04-02 | Headway Technologies Inc | Tmr素子およびその形成方法 |
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US8557407B2 (en) | 2013-10-15 |
US8337676B2 (en) | 2012-12-25 |
US7780820B2 (en) | 2010-08-24 |
US20100320076A1 (en) | 2010-12-23 |
US20100304185A1 (en) | 2010-12-02 |
US20070111332A1 (en) | 2007-05-17 |
JP5138204B2 (ja) | 2013-02-06 |
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