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• W4361767588 abstract "We present a comprehensive study of multidomain (MD) effects in a perpendicular magnetic tunnel junction (p-MTJ). The MD nucleation is considered in the free layer of MTJ, which alters the spatial net-magnetic field ( <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${H}_{text {eff}}$ </tex-math></inline-formula> ) and magnetization vector ( <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${M}_{e}$ </tex-math></inline-formula> ). These variations in <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${H}_{text {eff}}$ </tex-math></inline-formula> and <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${M}_{e}$ </tex-math></inline-formula> cause a reduction in the field-like and spin-transfer torques. Furthermore, due to the increased inertia, the switching probability of the MD state is smaller than that of the mono-domain state. We also show that MD formation in the free layer leads to multistate storage in a single MTJ device. We observe a trade-off between the device’s multistate storage and tunnel magnetoresistance (TMR) ratio: an enhancement in the multistate leads to a reduction in the TMR ratio. MD texture in the free layer is obtained by the coupled solution of 2-D Poisson’s equation with the ferromagnetic net energy state equation (MD demagnetization energy + exchange energy + Dzyaloshinskii–Moriya interaction (DMI) + Zeeman energy + anisotropy energy). Following that, the MD switching characteristics are captured by plugging <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${H}_{text {eff}}$ </tex-math></inline-formula> and <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${M}_{e}$ </tex-math></inline-formula> into the Landau–Lifshitz–Gilbert (LLG) equation. Our work opens a new era of MD dynamics in the MTJ, which can be utilized to realize an efficient multistate magnetic random access memories (MRAM)." @default.
• W4361767588 created "2023-04-04" @default.
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• W4361767588 date "2023-05-01" @default.
• W4361767588 modified "2023-09-27" @default.
• W4361767588 title "Multidomain Interactions in Perpendicular Magnetic Tunnel Junction (p-MTJ): Enabling Multistate MRAM" @default.
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• W4361767588 doi "https://doi.org/10.1109/ted.2023.3259927" @default.
• W4361767588 hasPublicationYear "2023" @default.
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