JP2018501647A - 磁気セル構造体、および製造の方法 - Google Patents
磁気セル構造体、および製造の方法 Download PDFInfo
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 187
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 93
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N50/00—Galvanomagnetic devices
- H10N50/10—Magnetoresistive devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N50/00—Galvanomagnetic devices
- H10N50/80—Constructional details
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/02—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements
- G11C11/16—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using elements in which the storage effect is based on magnetic spin effect
- G11C11/161—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using elements in which the storage effect is based on magnetic spin effect details concerning the memory cell structure, e.g. the layers of the ferromagnetic memory cell
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N50/00—Galvanomagnetic devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N50/00—Galvanomagnetic devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B61/00—Magnetic memory devices, e.g. magnetoresistive RAM [MRAM] devices
- H10B61/20—Magnetic memory devices, e.g. magnetoresistive RAM [MRAM] devices comprising components having three or more electrodes, e.g. transistors
- H10B61/22—Magnetic memory devices, e.g. magnetoresistive RAM [MRAM] devices comprising components having three or more electrodes, e.g. transistors of the field-effect transistor [FET] type
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Abstract
Description
本出願は、「MAGNETIC CELL STRUCTURES, AND METHODS OF FABRICATION」について2014年12月2日に出願された米国特許出願整理番号14/558,367号の出願日の利益を享受する権利を主張する。
[例1]
図6は、(例えば、タンタルとルテニウムのみを含む)従来のシード材料を含む磁気構造体と比べた、白金含有シード材料を含む磁気構造体の異方性磁界(つまり、Hk)のグラフ的表現である。コバルトと白金の交互になっている領域を含む磁気構造体を、白金含有シード材料と従来のシード材料のそれぞれの上に形成した。白金含有シード材料は、基板の上の約30Åのタンタルと、タンタルの上の約50Åの白金と、白金の上の約50Åのルテニウムとを含んでいた。従来のシード材料は、基板の上の約30Åのタンタルと、タンタルのすぐ上の約50Åのルテニウムとを含んでいた。白金含有シード材料を含む磁気構造体の異方性磁界は、従来のシード材料を含む磁気構造体の異方性よりも、約25パーセント(25%)大きかった。例えば、面内ループ評価は、従来のシード材料を使った磁気構造体の約12,000 Oeに比べて、白金含有シード材料を含む磁気構造体に対しては、約15,000 OeというHk値(MA強度の指標)を示した。面内ループ評価は、白金含有シード材料を含む磁気構造体について、改善したPMAを示した。また、白金を含むシード材料を含む磁気構造体は、従来のシード材料の上に形成された磁気構造体よりも、磁気配向の変化を起こしにくかった。
図7は、従来のシード材料を含む磁気セル構造体の磁気特性を、白金含有シード材料を含む磁気セル構造体の磁気特性と比較する、面外ループである。図2の磁気セル構造体100と類似の磁気セル構造体を、白金含有シード材料の上と従来のシード材料の上に形成した。白金含有シード材料は、基板の上の約30Åのタンタルと、タンタルの上の約50Åの白金と、白金の上の約50Åのルテニウムとを含んでいた。従来のシード材料は、基板の上のタンタルと、タンタルの上のルテニウムとを含んでいた。磁気セル構造体の各々を、約1時間にわたり約300℃の焼きなまし状態にさらした。白金含有シード材料を含む磁気セル構造体は、従来のシード材料を含む磁気セル構造体と比べて、改善した交換結合を示した。従来のシード材料を使った磁気セル構造体が、固定領域の上側の人工超格子構造と下側の人工超格子構造との間(例えば、人工超格子構造120と別の人工超格子構造124との間)での、約7,750 Oeという交換結合強度を示したのに対して、白金含有シード材料を使った磁気セル構造体は、固定領域の上側人工超格子構造(例えば、別の人工超格子構造124)についての、約8,255 Oeという交換結合磁場を示した。このように、白金含有シード材料を含む磁気セル構造体は、他の磁気セル構造体と比べて、約7パーセント(7%)の面外磁界の増加(例えばPMAの増加)を示した。
図9Aは、図7を参照して上述したような白金含有シード材料を用いた磁気セル構造体に類似した磁気セル構造体の、面外磁界を示すグラフ的表現である。図9Aの磁気セル構造体のうちの一方における白金含有シード材料を結晶基板上に成長させ(左側目盛)、図9Aの他方の磁気セル構造体を非晶質基板上に成長させた(右側目盛)。結晶基板上に成長させた磁気セル構造体のシード材料のタンタル部分もまた、結晶質であった。結晶質タンタルの上に形成された白金およびルテニウムは、異なる結晶方位を持った結晶粒を有する、多結晶の特徴を示した。シード材料の上に形成された人工超格子構造(例えば、固定領域のCo/Pt人工超格子構造)は、PMAの減少と、ルテニウム結合材料を介した人工超格子構造同士の間の弱い反強磁性結合とを示した。非晶質基板の上に形成されたタンタル部分は、非晶質だった。シード材料の白金とルテニウムの部分は、一様な結晶構造を示し、シード材料の上に形成された人工超格子構造は、強いPMAと、ルテニウム結合材料への反強磁性結合とを示した。グラフに示されているとおり、非晶質基板上に成長させた磁気セル構造体は、結晶基板上に成長させた磁気セル構造体と比べて、鋭い反転特性を示した。
Claims (19)
- 基板の上の電極の上にある少なくとも一つの磁気セル構造体であって、
前記電極の上にある、タンタルと白金とルテニウムとを含むシード材料、
前記シード材料の上にある磁性領域、
前記磁性領域の上にある絶縁材料、および
前記絶縁材料の上にある別の磁性領域、
を含む、前記少なくとも一つの磁気セル構造体、ならびに
前記別の磁性領域の上にある別の電極
を含む、半導体デバイス。 - 前記少なくとも一つの磁気セル構造体が、磁気セル構造体のアレイを含むことを特徴とする、請求項1の半導体デバイス。
- 前記タンタルを含む、前記シード材料の一領域と、前記ルテニウムを含む、前記シード材料の別の領域との間に、前記シード材料の前記白金が配置されていることを特徴とする、請求項1または2のいずれか1項の半導体デバイス。
- 前記磁性領域が、前記シード材料の前記ルテニウムのすぐ上にあることを特徴とする、請求項1から3のいずれか1項の半導体デバイス。
- 前記磁性領域が、コバルトと白金の交互になっている部分を含むことを特徴とする、請求項1から4のいずれか1項の半導体デバイス。
- コバルトの前記交互になっている部分が、約1.0Åから約6.0Åまでのコバルトを含むことを特徴とする、請求項5の半導体デバイス。
- 前記シード材料の下にある、ニッケルとコバルトとを含む非晶質領域をさらに含む、請求項1から6のいずれか1項の半導体デバイス。
- 前記シード材料の前記タンタルが、前記非晶質領域に接触していることを特徴とする、請求項7の半導体デバイス。
- コバルトと、白金とパラジウムとニッケルとイリジウムのうちの少なくとも一つとが、交互になっている部分を、前記別の磁性領域が含むことを特徴とする、請求項1から8のいずれか1項の半導体デバイス。
- 前記磁性領域と前記別の磁性領域が、垂直な磁気配向を示すことを特徴とする、請求項1から9のいずれか1項の半導体デバイス。
- 前記磁性領域が、固定された磁気配向を示すことを特徴とする、請求項1から10のいずれか1項の半導体デバイス。
- 前記シード材料が、約10Åから約1,000Åまでの厚さを有する白金部分を含むことを特徴とする、請求項1から11のいずれか1項の半導体デバイス。
- 前記白金部分が、原子百分率で約90パーセントから原子百分率で約100パーセントまでの白金を含むことを特徴とする、請求項12の半導体デバイス。
- 前記シード材料が、前記基板の上にあるタンタル部分と、前記タンタル部分の上にある白金部分と、前記白金部分の上にあるルテニウム部分とを含むことを特徴とする、請求項1から13のいずれか1項の半導体デバイス。
- 基板上の電極の上に、磁気セル構造体のアレイを形成することであって、
前記電極の上に、タンタルと白金とルテニウムとを含むシード材料を形成すること、
前記シード材料の上に磁性材料を形成すること、
前記磁性材料の上に絶縁材料を形成すること、および
前記絶縁材料の上に別の磁性材料を形成すること
を含む、前記磁気セル構造体のアレイを形成すること、ならびに
前記アレイの前記磁気セル構造体の各々の前記別の磁性材料の上に、別の電極を形成すること
を含む、半導体デバイスを形成する方法。 - 前記シード材料と前記磁性材料とを、約360℃の温度で約1時間にわたり焼きなますことをさらに含む、請求項15の方法。
- ニッケルとクロムとを含む非晶質材料を、前記基板と前記シード材料との間に形成することをさらに含む、請求項15または16のいずれか1項の方法。
- 前記シード材料の上に磁性材料を形成することが、固定された磁気配向を示す磁性材料を前記シード材料の上に形成することを含むことを特徴とする、請求項15から17のいずれか1項の方法。
- 前記電極の上に、タンタルと白金とルテニウムとを含むシード材料を形成することが、
前記基板の上にタンタルを形成すること、
前記タンタルの上にルテニウムを形成すること、および
前記タンタルと前記ルテニウムとの間に白金を形成すること
を含むことを特徴とする、請求項15から18のいずれか1項の方法。
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