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    • 8. 发明专利
    • Multi-bit cell having synthetic memory layer
    • 具有合成记忆层的多位单元
    • JP2012248835A
    • 2012-12-13
    • JP2012116154
    • 2012-05-22
    • Crocus Technology Saクロッカス・テクノロジー・ソシエテ・アノニム
    • LUCIAN RONBERIOAN LUCIAN PREJBEANU
    • H01L21/8246G11C11/15H01L27/105H01L43/08
    • G11C11/5607G11C11/161G11C11/1673G11C11/1675
    • PROBLEM TO BE SOLVED: To provide a method for writing and reading data bits larger than 2-data bits to and from an MRAM cell, in which the MRAM cell is constituted by a magnetic tunnel junction formed of a reading layer exhibiting a reading magnetization direction, and a storage layer including a first storage ferromagnetic layer exhibiting a first storage magnetization direction and a second storage ferromagnetic layer exhibiting a second storage magnetization direction.SOLUTION: This method comprises: a step of heating a magnetic tunnel junction at a temperature higher than a high-temperature threshold; and a step of orienting a first storage magnetization direction to a second magnetization direction at a certain angle. As a result, the magnetic tunnel junction reaches one resistance state level determined by the first storage magnetization direction relative to a reading magnetization direction. In this method, by using only one current line for generating a writing region, at least four different state levels can be stored in an MRAM cell.
    • 要解决的问题:提供一种用于向MRAM单元写入和读取大于2-数据位的数据位的方法,其中MRAM单元由磁性隧道结构成,该磁性隧道结由表现出 读取磁化方向,以及存储层,其包括呈现第一存储磁化方向的第一存储铁磁层和呈现第二存储磁化方向的第二存储铁磁层。 解决方案:该方法包括:在高于高温阈值的温度下加热磁性隧道结的步骤; 以及以一定角度将第一存储磁化方向定向到第二磁化方向的步骤。 结果,磁隧道结达到相对于读取磁化方向由第一存储磁化方向确定的一个电阻状态电平。 在该方法中,通过仅使用一条电流线来产生写入区域,可以在MRAM单元中存储至少四个不同的状态电平。 版权所有(C)2013,JPO&INPIT
    • 9. 发明专利
    • Low power magnetic random access memory cell
    • 低功率磁力随机存取存储器单元
    • JP2012151476A
    • 2012-08-09
    • JP2012007603
    • 2012-01-18
    • Crocus Technology Saクロッカス・テクノロジー・ソシエテ・アノニム
    • IOAN LUCIAN PREJBEANUDUCRUET CLARISSECELINE PORTEMONT
    • H01L27/105H01L21/8246H01L29/82H01L43/08
    • G11C11/161G11C11/1675
    • PROBLEM TO BE SOLVED: To provide a low power magnetic random access memory cell.SOLUTION: The present invention relates to a magnetic random access memory (MRAM) cell suitable for executing a heat-assist writing operation or a writing operation based a spin torque transfer (STT). The MRAM is provided with a magnetic tunnel junction. The magnetic tunnel junction comprises an upper electrode, a tunnel barrier layer formed between a first ferromagnetic layer having a first magnetization direction and a second ferromagnetic layer having a second magnetization direction adjustable to the first magnetization direction, a front end layer, and a magnetic layer or a metal layer, on which the second ferromagnetic layer is accumulated. The second ferromagnetic layer is formed between the front end layer and the tunnel barrier layer, and has thickness of about 0.5 nm to about 2 nm. As a result, the magnetic tunnel junction has magnetic resistance larger by about 100%. The MRAM cell disclosed in the present invention has power consumption lower than that of a conventional MRAM cell.
    • 要解决的问题:提供一种低功率磁性随机存取存储单元。 解决方案:本发明涉及一种适用于执行基于自旋转矩传递(STT)的热辅助写入操作或写入操作的磁随机存取存储器(MRAM)单元。 MRAM设有磁性隧道结。 磁性隧道结包括上电极,形成在具有第一磁化方向的第一铁磁层之间的隧道势垒层和具有可向第一磁化方向调节的第二磁化方向的第二铁磁层,前端层和磁性层 或金属层,第二铁磁层被积聚在其上。 第二铁磁层形成在前端层和隧道势垒层之间,并且具有约0.5nm至约2nm的厚度。 结果,磁性隧道结具有大约100%的磁阻。 本发明公开的MRAM单元的功耗低于常规MRAM单元的功耗。 版权所有(C)2012,JPO&INPIT