JP2007299512A - 反平行フリー層構造および低電流誘起ノイズの面直電流型(cpp)磁気抵抗センサ - Google Patents
反平行フリー層構造および低電流誘起ノイズの面直電流型(cpp)磁気抵抗センサ Download PDFInfo
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- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
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Abstract
【解決手段】反平行フリー(APF)構造を備え、センス電流の方向を特定の方向に限定した面直電流型(CPP)磁気抵抗センサ200は、第1フリー強磁性層(FL1)201、第2フリー強磁性層(FL2)202、および、反平行結合APC層203から成り、APC層203は、FL1とFL2を反強磁性的に結合し、その結果、FL1とFL2がほぼ反平行の磁化方向を有し、磁界が存在すると一致して回転する。FL1とFL2の厚さは、センサのフリー層全体(APF)として望ましい磁気モーメント/面積が得られるように設定する。FL1の厚さは、バルクスピン依存散乱を増加させてセンサ信号を大きくするためにFL1材料における電子のスピン拡散距離よりも大きくすることが好ましい。
【選択図】図5
Description
したがって、磁気抵抗効果やセンサ分解能を低下させることなく電流誘起ノイズを最小限に抑えたCPPセンサが求められている。
113…上部電気配線、
120…強磁性層(AP2)、
121…AP2の磁化方向、
122…強磁性層(AP1)、
123…AP結合層(APC)、
124…反強磁性層(AF)、
125…シード層、
126…下部電気配線、
127…AP1の磁化方向、
200…CPP-SVセンサ、
201…第1フリー強磁性層(FL1)、
202…第2フリー強磁性層(FL2)、
203…反平行結合層(APC)、
211…FL1の磁化方向、
212…FL2の磁化方向、
230…スペーサ層。
Claims (24)
- センス電流源に接続するための電気配線を有する磁気抵抗センサであって、
面内磁化方向を有する固定強磁性層と、
面内磁化方向を有する第1フリー強磁性層(FL1)、該FL1の磁化方向に対してほぼ反平行の面内磁化方向を有し、前記FL1の磁気モーメントよりも小さな磁気モーメントを有する第2フリー強磁性層(FL2)、および、前記FL1と前記FL2の両者に接触した状態で挟まれ、Ru, Ir, Rhあるいはそれらの合金のいずれかを主材料とするAP結合(APC: AP coupling)層から成る反平行フリー(APF: antiparallel free)構造と、
前記固定強磁性層と前記FL1の間にあって、Cu, AgおよびAuのいずれかの元素を主材料とする導電性スペーサ層と、を備え、
センス電流がセンサ内の各層に対して垂直に前記固定強磁性層から前記APF構造の方向に印加されているときに外部磁界を検出可能な磁気抵抗センサ。 - 請求項1記載のセンサであって、さらに、基板と、該基板上の第1電気配線層と、第2電気配線層を備えたセンサ。
- 請求項2記載のセンサであって、前記固定強磁性層が前記第1配線層上に、前記スペーサ層が前記固定強磁性層上に、前記FL1が前記スペーサ層上に、前記第2配線層が前記APF構造上に配置され、センス電流が前記第1配線層から前記第2配線層の方向に印加されるセンサ。
- 請求項1記載のセンサであって、前記FL1が、Feとともに、Ni、Coのうち少なくとも1つを含む結晶性合金を含むセンサ。
- 請求項1記載のセンサであって、前記FL1が、非磁性元素Xとともに、Co, Ni, Feのうち少なくとも1つを含むアモルファス強磁性合金を含むセンサ。
- 請求項1記載のセンサであって、前記FL1が強磁性ホイスラ合金を含むセンサ。
- 請求項1記載のセンサであって、前記APF構造全体の磁気モーメント/面積が、100オングストロームのNiFeの磁気モーメント/面積よりも小さいセンサ。
- 請求項1記載のセンサであって、前記FL1の厚さが、該FL1を形成している材料のスピン拡散長の110%以上であるセンサ。
- 請求項1記載のセンサであって、前記FL1が主としてNiFeで形成され、厚さが45オングストローム以上であるセンサ。
- 請求項1記載のセンサであって、前記FL1と前記FL2がほぼ同じ材料で形成され、前記FL2の厚さがFL1の厚さの25%よりも大きいセンサ。
- 請求項1記載のセンサであって、センス電流がセンサ内の各層に対して垂直に前記固定強磁性方向から前記APF構造の向きに印加されているときのセンサの電流誘起ノイズが、センス電流がセンサ内の各層に対して垂直に前記APF構造から前記固定強磁性層の方向に印加されているときのセンサの電流誘起ノイズよりも実質的に小さいセンサ。
- 請求項1記載のセンサであって、前記固定強磁性層が、面内磁化方向を有する第1AP固定強磁性層(AP1)と、該AP1の磁化方向に対してほぼ反平行の面内磁化方向を有する第2AP固定強磁性層(AP2)と、前記AP1とAP2の両者に接触した状態で挟まれたAP結合(APC: AP coupling)層から成る反平行(AP: Antiparallel)固定構造を有し、前記導電性スペーサ層が前記AP2層上に配置されたセンサ。
- 請求項12記載のセンサであって、前記AP固定構造が自己固定構造であるセンサ。
- 請求項12記載のセンサであって、さらに、前記AP1層の磁化方向を固定するために前記AP1層に交換結合された反強磁性層を備えたセンサ。
- 請求項12記載のセンサであって、さらに、前記AP1層の磁化方向を固定するための硬質磁性体層を前記AP1層に接触した状態で備えたセンサ。
- 請求項1記載のセンサであって、磁気的に記録されたデータを磁気記録媒体上のトラックから読み取るための磁気抵抗再生ヘッドであり、前記電気配線が透磁性材料で形成されたシールドであるセンサ。
- 磁気的に記録されたデータを磁気記録媒体上のトラックから読み取るための面直電流型磁気抵抗再生ヘッドであって、第1電気配線から第2電気配線の方向にセンス電流が印加されるヘッドであって、
基板と、
前記基板上の第1電気配線層と、
前記第1電気配線層上の固定強磁性層であって、面内磁化方向を有する固定強磁性層と、
前記固定強磁性層上の導電性スペーサ層であって、主としてCu, Ag, Auのいずれかの元素から成るスペーサ層と、
前記スペーサ層上にあって面内磁化方向を有する第1強磁性層(FL1)と、該FL1の磁化方向に対してほぼ反平行の面内磁化方向と、該FL1の磁気モーメントよりも小さな磁気モーメントを有する第2フリー強磁性層(FL2)と、前記FL1と前記FL2の両者に接触した状態で挟まれ、Ru, Ir, Rhあるいはそれらの合金のいずれかを主材料とするAP結合(APC: AP coupling)層から成る反平行フリー(APF: antiparallel free)構造であって、前記FL1と前記FL2のそれぞれが、Feとともに、NiとCoのいずれか1つまたは両方を含んだ合金で形成され、前記FL2の厚さが前記FL1の厚さの25%を越えるAPF構造と、
前記FL2上の第2電気配線層とを備えたヘッド。 - 請求項17記載のヘッドであって、前記FL1および前記FL2の合金のうち少なくとも1つが非磁性元素を含んだアモルファス強磁性合金であるヘッド。
- 請求項17記載のヘッドであって、前記FL1が非磁性元素Xとともに、Co, Ni, Feのうち少なくとも1つを含むアモルファス強磁性合金を含むヘッド。
- 請求項17記載のヘッドであって、前記APF構造全体の磁気モーメント/面積が、100オングストロームのNiFeの磁気モーメント/面積よりも小さいヘッド。
- 請求項17記載のヘッドであって、前記FL1の厚さが、FL1を形成している材料のスピン拡散長の110%以上であるヘッド。
- 請求項17記載のヘッドであって、前記FL1が主としてNiFeで形成され、厚さが45オングストローム以上であるヘッド。
- 請求項17記載のヘッドであって、センス電流が前記第1電気配線層から前記第2電気配線層の方向に印加されているときのヘッドの電流誘起ノイズが、センス電流が前記第2電気配線層から前記第1電気配線層の方向に印加されているときのヘッドの電流誘起ノイズよりも実質的に小さいヘッド。
- 請求項17記載のヘッドであって、前記固定強磁性層が、面内磁化方向を有する第1AP固定強磁性層(AP1)と、該AP1の磁化方向に対してほぼ反平行の面内磁化方向を有する第2AP固定強磁性層(AP2)と、前記AP1とAP2の両者に接触した状態で挟まれたAP結合(APC: AP coupling)層から成る反平行(AP: Antiparallel)固定構造を有し、前記導電性スペーサ層が前記AP2層上に配置されたヘッド。
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US11/380625 | 2006-04-27 | ||
US11/380,625 US7580229B2 (en) | 2006-04-27 | 2006-04-27 | Current-perpendicular-to-the-plane (CPP) magnetoresistive sensor with antiparallel-free layer structure and low current-induced noise |
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US8611053B2 (en) | 2012-03-08 | 2013-12-17 | HGST Netherlands B.V. | Current-perpendicular-to-the-plane (CPP) magnetoresistive sensor with multilayer reference layer including a Heusler alloy |
US8617644B2 (en) | 2012-03-08 | 2013-12-31 | HGST Netherlands B.V. | Method for making a current-perpendicular-to-the-plane (CPP) magnetoresistive sensor containing a ferromagnetic alloy requiring post-deposition annealing |
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JP2013211472A (ja) * | 2012-03-30 | 2013-10-10 | Alps Electric Co Ltd | 磁気検出素子及びそれを用いた磁気センサ |
Also Published As
Publication number | Publication date |
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CN101067933A (zh) | 2007-11-07 |
US7580229B2 (en) | 2009-08-25 |
US20070253119A1 (en) | 2007-11-01 |
JP4912207B2 (ja) | 2012-04-11 |
EP1850144A1 (en) | 2007-10-31 |
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