Low‐Current, High‐Speed Magnetic Memory Array Utilizing Evaporated Matrix Wiring

T. J. Matcovich; W. Flannery; W. Luciw; A. A. Adomines

doi:10.1063/1.1713464

Low‐Current, High‐Speed Magnetic Memory Array Utilizing Evaporated Matrix Wiring

Journal of Applied Physics ◽

10.1063/1.1713464 ◽

1964 ◽

Vol 35 (3) ◽

pp. 760-761 ◽

Cited By ~ 2

Author(s):

T. J. Matcovich ◽

W. Flannery ◽

W. Luciw ◽

A. A. Adomines

Keyword(s):

High Speed ◽

Magnetic Memory ◽

Memory Array

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855. Low-current, high-speed magnetic memory array utilizing evaporated matrix wiring

Vacuum ◽

10.1016/0042-207x(64)92059-7 ◽

1964 ◽

Vol 14 (8) ◽

pp. 320

Keyword(s):

High Speed ◽

Magnetic Memory ◽

Memory Array

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Ultrathin perpendicular magnetic anisotropy CoFeB free layers for highly efficient, high speed writing in spin-transfer-torque magnetic random access memory

Scientific Reports ◽

10.1038/s41598-019-54466-7 ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 4

Author(s):

Jodi M. Iwata-Harms ◽

Guenole Jan ◽

Santiago Serrano-Guisan ◽

Luc Thomas ◽

Huanlong Liu ◽

...

Keyword(s):

Magnetic Anisotropy ◽

High Speed ◽

Random Access ◽

Perpendicular Magnetic Anisotropy ◽

Spin Transfer Torque ◽

Tunnel Barrier ◽

Magnetic Memory ◽

Material System ◽

Highly Efficient ◽

Memory Applications

AbstractPerpendicular magnetic anisotropy (PMA) ferromagnetic CoFeB with dual MgO interfaces is an attractive material system for realizing magnetic memory applications that require highly efficient, high speed current-induced magnetic switching. Using this structure, a sub-nanometer CoFeB layer has the potential to simultaneously exhibit efficient, high speed switching in accordance with the conservation of spin angular momentum, and high thermal stability owing to the enhanced interfacial PMA that arises from the two CoFeB-MgO interfaces. However, the difficulty in attaining PMA in ultrathin CoFeB layers has imposed the use of thicker CoFeB layers which are incompatible with high speed requirements. In this work, we succeeded in depositing a functional CoFeB layer as thin as five monolayers between two MgO interfaces using magnetron sputtering. Remarkably, the insertion of Mg within the CoFeB gave rise to an ultrathin CoFeB layer with large anisotropy, high saturation magnetization, and good annealing stability to temperatures upwards of 400 °C. When combined with a low resistance-area product MgO tunnel barrier, ultrathin CoFeB magnetic tunnel junctions (MTJs) demonstrate switching voltages below 500 mV at speeds as fast as 1 ns in 30 nm devices, thus opening a new realm of high speed and highly efficient nonvolatile memory applications.

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