JP2011086944A - 垂直磁化磁性層を有する磁気トンネル接合構造 - Google Patents
垂直磁化磁性層を有する磁気トンネル接合構造 Download PDFInfo
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Abstract
【解決手段】固定磁化方向を有する第1磁性層10、反転可能な磁化方向を有する第2磁性層20、第1と第2磁性層との間に形成される非磁性層70、第1磁性層との磁性結合により第1磁性層の磁化方向が薄膜面に対して垂直となるようにし、垂直磁気異方性エネルギーが水平より大きい第3磁性層30、第1と第3磁性層との間に形成され、該2層の結晶配向性を分離する第1結晶構造分離層50、第2磁性層との磁性結合により第2磁性層の磁化方向が薄膜面に対して垂直となるようにし、垂直磁気異方性エネルギーが水平より大きい第4磁性層40、第2と第4磁性層との間に形成され、該2層の結晶配向性を分離する第2結晶構造分離層60を含む。
【選択図】図1
Description
20 第2磁性層
30 第3磁性層
40 第4磁性層
50 第1結晶構造分離層
60 第2結晶構造分離層
70 非磁性層(トンネル障壁層)
80 下地層(バッファ層)
Claims (20)
- 固定された磁化方向を有する第1磁性層と、
反転可能な磁化方向を有する第2磁性層と、
前記第1磁性層と前記第2磁性層との間に形成される非磁性層(トンネル障壁層)と、
前記第1磁性層との磁性結合により前記第1磁性層の磁化方向が薄膜面に対して垂直となるようにし、垂直磁気異方性エネルギーが水平磁気異方性エネルギーより大きい第3磁性層と、
前記第1磁性層と前記第3磁性層との間に形成され、前記第1磁性層の結晶配向性と前記第3磁性層の結晶配向性を分離する第1結晶構造分離層と、
前記第2磁性層との磁性結合により前記第2磁性層の磁化方向が薄膜面に対して垂直となるようにし、垂直磁気異方性エネルギーが水平磁気異方性エネルギーより大きい第4磁性層と、
前記第2磁性層と前記第4磁性層との間に形成され、前記第2磁性層の結晶配向性と前記第4磁性層の結晶配向性を分離する第2結晶構造分離層と
を含むことを特徴とする磁気トンネル接合構造。 - 前記非磁性層は、絶縁体又は半導体を含み、前記絶縁体は、MgO、Al2O3、HfO2、TiO2、Y2O3、及びYb2O3からなる群から選択された少なくとも1つであることを特徴とする請求項1に記載の磁気トンネル接合構造。
- 前記第1磁性層は、磁性層/非磁性層/磁性層の積層構造を有することを特徴とする請求項1に記載の磁気トンネル接合構造。
- 前記第1磁性層と前記第2磁性層の少なくとも一方の磁性層は、FeX、CoX、NiX、FeCoX、CoNiX、又はNiFeX(ここで、XはB、Re、Rh、Cr、Cu、Gd、及びTbからなる群から選択された少なくとも1つ)を含むことを特徴とする請求項1に記載の磁気トンネル接合構造。
- 前記第1磁性層と前記第2磁性層の少なくとも一方の磁性層は、体心立方格子構造を有し、前記第3磁性層と前記第4磁性層の少なくとも一方の磁性層は、面心立方格子構造、面心正方格子構造、又は稠密六方格子構造を有することを特徴とする請求項1に記載の磁気トンネル接合構造。
- 前記第3磁性層及び前記第4磁性層の磁化容易軸は、それぞれ前記第1磁性層及び前記第2磁性層の平面に対して垂直方向に配向されることを特徴とする請求項1に記載の磁気トンネル接合構造。
- 前記第3磁性層及び前記第4磁性層の磁化方向がそれぞれ前記第3磁性層及び前記第4磁性層の平面に対して傾斜した角度は、60゜≦θ≦120゜であることを特徴とする請求項1に記載の磁気トンネル接合構造。
- 前記第3磁性層と前記第4磁性層の少なくとも一方の磁性層は、面心正方構造を有する合金を含むことを特徴とする請求項1に記載の磁気トンネル接合構造。
- 前記面心正方構造を有する合金は、FePt、CoPt、FePd、及びMnAlからなる群から選択された少なくとも1つであることを特徴とする請求項8に記載の磁気トンネル接合構造。
- 前記第3磁性層と前記第4磁性層の少なくとも一方の磁性層は、稠密六方構造を有する合金を含むことを特徴とする請求項1に記載の磁気トンネル接合構造。
- 前記稠密六方構造を有する合金は、Co3Pt合金又はCoCrPt合金であることを特徴とする請求項10に記載の磁気トンネル接合構造。
- 前記第3磁性層と前記第4磁性層の少なくとも一方の磁性層は、希土類遷移金属合金を含むことを特徴とする請求項1に記載の磁気トンネル接合構造。
- 前記希土類遷移金属合金は、Fe14Nd2B又はSmCo5であることを特徴とする請求項12に記載の磁気トンネル接合構造。
- 前記第3磁性層と前記第4磁性層の少なくとも一方の磁性層は、多層薄膜を含むことを特徴とする請求項1に記載の磁気トンネル接合構造。
- 前記多層薄膜は、[Co/Pt]n、[CoX合金/Pt]n、[Co/Pd]n、[CoX合金/Pd]n、[Co/Ni]n、[CoX合金/Ni]n、又は[Ni/Pt]nであり、前記nは、1から10の数字であり、前記Xは、Fe、Ni、Cr、Ru、Re、Rh、Gd、及びTbからなる群から選択された少なくとも1つであることを特徴とする請求項14に記載の磁気トンネル接合構造。
- 前記第1結晶構造分離層と前記第2結晶構造分離層の少なくとも一方の結晶構造分離層は、非晶質構造を有することを特徴とする請求項1に記載の磁気トンネル接合構造。
- 前記第1結晶構造分離層と前記第2結晶構造分離層の少なくとも一方の結晶構造分離層は、200〜600℃の温度で熱処理しても非晶質構造が維持される物質を含むことを特徴とする請求項1に記載の磁気トンネル接合構造。
- 前記第1結晶構造分離層と前記第2結晶構造分離層の少なくとも一方の結晶構造分離層は、Ru、Ta、Re、Hf、W、Os、Ir、及びRhからなる群から独立して選択された少なくとも1つを含むことを特徴とする請求項1に記載の磁気トンネル接合構造。
- 前記第3磁性層の下に形成される下地層をさらに含むことを特徴とする請求項1に記載の磁気トンネル接合構造。
- 前記下地層は、Au、Cu、Pd、Pt、Ta、及びダイヤモンド状炭素からなる群から選択された少なくとも1つを含むことを特徴とする請求項19に記載の磁気トンネル接合構造。
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