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    • 6. 发明公开
    • NON-CONTACT CURRENT SENSOR
    • KONTAKTFREIER STROMSENSOR
    • EP2461168A1
    • 2012-06-06
    • EP10804161.7
    • 2010-04-12
    • Fuji Electric Co., Ltd.
    • OGIMOTO, Yasushi
    • G01R15/20H01L43/08
    • G01R15/205G01R15/148G01R33/093G01R33/098
    • According to the present invention, a spin valve structure (2), an electrical unit (4) that applies a current to the spin valve structure (2), and a resistance reading unit that electrically reads out a resistance value of the spin valve structure (2) are included, in which when a current-induced magnetic field is detected, a coercive force of a free layer (14) is configured to be larger than the current-induced magnetic field as a detection target, the electrical unit (4) allows magnetization directions of a pinned layer (12) and the free layer (14) to transit between a mutually parallel state and a mutually anti-parallel state by applying the current to the spin valve structure (2), and the resistance reading unit (5) is configured to detect a threshold value of the current or the current-induced magnetic field corresponding to transition by reading out the resistance value corresponding to the transition between the parallel state and the anti-parallel state.
    • 根据本发明,自旋阀结构(2),向自旋阀结构(2)施加电流的电单元(4)以及电读取单元,其电读出自旋阀结构的电阻值 (2),其中当检测到电流感应磁场时,自由层(14)的矫顽力被配置为大于作为检测对象的电流感应磁场,电气单元(4) )通过将电流施加到自旋阀结构(2),允许被钉扎层(12)和自由层(14)的磁化方向在相互平行的状态和相互反平行状态之间转变,并且电阻读取单元 (5)被配置为通过读出对应于并行状态和反并行状态之间的转变的电阻值来检测与转变相对应的电流或电流感应磁场的阈值。
    • 8. 发明公开
    • MAGNETIC MEMORY ELEMENT AND DRIVING METHOD THEREFOR
    • 波士顿大学的研究人员
    • EP2385548A1
    • 2011-11-09
    • EP10793917.5
    • 2010-05-14
    • Fuji Electric Co., Ltd.
    • OGIMOTO, Yasushi
    • H01L21/8246G11C11/15H01F10/14H01F10/32H01L27/105H01L43/08
    • H01L43/08B82Y25/00G01R33/093G01R33/098G11C11/161G11C11/1673G11C11/1675H01F10/3254H01F10/3268H01F10/3286
    • This invention provides a magnetic memory element, and a method of driving such an element, which enable reduction of the current density during switching, without detracting from readout durability, retention characteristics, or other aspects of reliability. A magnetic memory element has a magnetic tunnel junction portion 20 with a spin-valve structure having a free layer 15 formed of a perpendicular magnetization film, a pinned layer 13 formed of a perpendicular magnetization film, and a nonmagnetic layer 14 sandwiched between the free layer 15 and the pinned layer 13, and records information by application of an electric pulse to the magnetic tunnel junction portion 20. An in-plane magnetization film 17, interposed in the path of the electric pulse, is disposed in the magnetic tunnel junction portion 20. The in-plane magnetization film 17 is configured so as to exhibit antiferromagnetic (low-temperature)-ferromagnetic (high-temperature) phase transitions depending on temperature changes based on application of the electric pulse to the magnetic tunnel junction portion 20. A method of driving a magnetic memory element has a step of providing, in the magnetic tunnel junction portion 20, an in-plane magnetization film 17 which exhibits antiferromagnetic (low-temperature)-ferromagnetic (high-temperature) phase transitions according to temperature; a step, during information record/erase, of applying an electric pulse of polarity suitable for information record/erase to the magnetic tunnel junction portion 20 via the in-plane magnetization film 17; and a step, during information readout, of applying an electric pulse of polarity suitable for information readout to the magnetic tunnel junction portion 20 via the in-plane magnetization film 17, to cause the temperature of the in-plane magnetization film 17 to be equal to or less than the transition temperature.
    • 本发明提供了一种磁存储元件和驱动这种元件的方法,其能够在切换期间降低电流密度,而不会降低读出耐久性,保留特性或可靠性的其它方面。 磁存储元件具有具有自旋阀结构的磁性隧道结部分20,该自旋阀结构具有由垂直磁化膜形成的自由层15,由垂直磁化膜形成的钉扎层13和夹在自由层之间的非磁性层14 15和被钉扎层13,并且通过施加电脉冲将信息记录到磁性隧道结部分20上。插入在电脉冲路径中的面内磁化膜17设置在磁性隧道结部分20中 平面内磁化膜17被配置为根据基于将电脉冲施加到磁性隧道结部分20的温度变化而呈现反铁磁(低温) - 铁磁(高温)相变。一种方法 驱动磁存储元件的步骤具有在磁性隧道结部分20中提供表面抗磁化膜17的平面内磁化膜17的步骤, 根据温度的铁磁(低温) - 铁磁(高温)相变; 在信息记录/擦除期间,经由面内磁化膜17将适合于信息记录/擦除的极性的电脉冲施加到磁性隧道结部分20的步骤; 以及在信息读出期间,经由面内磁化膜17将适合于信息读出的极性的电脉冲施加到磁性隧道结部20的步骤,以使平面内磁化膜17的温度相等 达到或小于转变温度。