PHYSICALLY UNCLONABLE FUNCTION BASED ON THE RANDOM LOGICAL STATE OF MAGNETORESISTIVE RANDOM-ACCESS MEMORY
    53.
    发明申请
    PHYSICALLY UNCLONABLE FUNCTION BASED ON THE RANDOM LOGICAL STATE OF MAGNETORESISTIVE RANDOM-ACCESS MEMORY 有权
    基于随机随机存取存储器的随机逻辑状态的物理不可靠函数

    公开(公告)号:US20150071431A1

    公开(公告)日:2015-03-12

    申请号:US14072634

    申请日:2013-11-05

    Abstract: One feature pertains to a method of implementing a physically unclonable function (PUF). The method includes exposing an array of magnetoresistive random access memory (MRAM) cells to an orthogonal external magnetic field. The MRAM cells are each configured to represent one of a first logical state and a second logical state, and the orthogonal external magnetic field is oriented in an orthogonal direction to an easy axis of a free layer of the MRAM cells to place the MRAM cells in a neutral logical state that is not the first logical state or the second logical state. The method further includes removing the orthogonal external magnetic field to place each of the MRAM cells of the array randomly in either the first logical state or the second logical state.

    Abstract translation: 一个特征涉及实现物理不可克隆功能(PUF)的方法。 该方法包括将磁阻随机存取存储器(MRAM)阵列阵列暴露于正交外部磁场。 MRAM单元各自被配置为表示第一逻辑状态和第二逻辑状态之一,并且正交外部磁场定向为与MRAM单元的自由层的容易轴正交的方向,以将MRAM单元置于 不是第一逻辑状态或第二逻辑状态的中性逻辑状态。 该方法还包括去除正交的外部磁场,将阵列的每个MRAM单元随机地置于第一逻辑状态或第二逻辑状态中。

    PHYSICALLY UNCLONABLE FUNCTION BASED ON THE INITIAL LOGICAL STATE OF MAGNETORESISTIVE RANDOM-ACCESS MEMORY
    54.
    发明申请
    PHYSICALLY UNCLONABLE FUNCTION BASED ON THE INITIAL LOGICAL STATE OF MAGNETORESISTIVE RANDOM-ACCESS MEMORY 有权
    基于磁性随机存取存储器的初始逻辑状态的物理不可靠函数

    公开(公告)号:US20150071430A1

    公开(公告)日:2015-03-12

    申请号:US14072599

    申请日:2013-11-05

    Abstract: One feature pertains to a method for implementing a physically unclonable function (PUF). The method includes providing an array of magnetoresistive random access memory (MRAM) cells, where the MRAM cells are each configured to represent one of a first logical state and a second logical state. The array of MRAM cells are un-annealed and free from exposure to an external magnetic field oriented in a direction configured to initialize the MRAM cells to a single logical state of the first and second logical states. Consequently, each MRAM cell has a random initial logical state of the first and second logical states. The method further includes sending a challenge to the MRAM cell array that reads logical states of select MRAM cells of the array, and obtaining a response to the challenge from the MRAM cell array that includes the logical states of the selected MRAM cells of the array.

    Abstract translation: 一个特征涉及用于实现物理不可克隆功能(PUF)的方法。 该方法包括提供磁阻随机存取存储器(MRAM)单元阵列,其中MRAM单元被配置为表示第一逻辑状态和第二逻辑状态之一。 MRAM单元的阵列是未退火的,并且没有暴露于被配置为将MRAM单元初始化的方向定向到第一和第二逻辑状态的单个逻辑状态的外部磁场。 因此,每个MRAM单元具有第一和第二逻辑状态的随机初始逻辑状态。 该方法还包括向MRAM单元阵列发送挑战,该MRAM单元阵列读取阵列的选择MRAM单元的逻辑状态,以及从包括阵列的所选MRAM单元的逻辑状态的MRAM单元阵列获得对挑战的响应。

    MTJ STRUCTURE AND INTEGRATION SCHEME
    55.
    发明申请
    MTJ STRUCTURE AND INTEGRATION SCHEME 有权
    MTJ结构与整合方案

    公开(公告)号:US20150056722A1

    公开(公告)日:2015-02-26

    申请号:US14518459

    申请日:2014-10-20

    CPC classification number: H01L43/12 H01L27/222 H01L43/08

    Abstract: A memory device may comprise a magnetic tunnel junction (MTJ) stack, a bottom electrode (BE) layer, and a contact layer. The MTJ stack may include a free layer, a barrier, and a pinned layer. The BE layer may be coupled to the MTJ stack, and encapsulated in a planarized layer. The BE layer may also have a substantial common axis with the MTJ stack. The contact layer may be embedded in the BE layer, and form an interface between the BE layer and the MTJ stack.

    Abstract translation: 存储器件可以包括磁性隧道结(MTJ)堆叠,底部电极(BE)层和接触层。 MTJ堆叠可以包括自由层,阻挡层和钉扎层。 BE层可以耦合到MTJ堆叠,并且封装在平坦化层中。 BE层也可以具有与MTJ叠层相当的共同轴。 接触层可以嵌入在BE层中,并且在BE层和MTJ堆叠之间形成界面。

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