VALLEYTRONIC LOGIC DEVICES COMPRISING MONOCHALCOGENIDES

    公开(公告)号:US20230413684A1

    公开(公告)日:2023-12-21

    申请号:US17843976

    申请日:2022-06-18

    CPC classification number: H01L43/10 H01L27/228 H01L43/04 H01L43/065 H01L43/14

    Abstract: Valleytronic devices comprise a channel layer having ferrovalley properties—band-spin splitting and Berry curvature dependence on the polarization of the channel layer. Certain monochalcogenides possess these ferrovalley properties. Valleytronic devices utilize ferrovalley properties to store and/or carry information. Valleytronic devices can comprise a cross geometry comprising a longitudinal portion and a transverse portion. A spin-polarized charge current injected into the longitudinal portion of the device is converted into a voltage output across the transverse portion via the inverse spin-valley Hall effect whereby charge carriers acquire an anomalous velocity in proportion to the Berry curvature and an applied in-plane electric field resulting from an applied input voltage. Due to the Berry curvature dependency on the material polarization, switching the polarity of the input voltage that switches the channel layer polarization also switches the polarity of the differential output voltage.

    CHIRAL COUPLING-BASED VALLEYTRONIC MAGNETOELECTRIC SPIN-ORBIT DEVICES

    公开(公告)号:US20240224814A1

    公开(公告)日:2024-07-04

    申请号:US18148240

    申请日:2022-12-29

    CPC classification number: H10N50/85 G11C11/161 H01F10/3286 H03K19/18 H10N52/80

    Abstract: Valleytronic magnetoelectric spin-orbit (MESO) logic devices comprise a charge-to-spin conversion input module that comprises a magnetoelectric capacitor. The input module converts a differential input voltage into a magnetization orientation of a ferromagnet possessing in-plane anisotropy (IPA) through exchange coupling between the IPA ferromagnet and the magnetoelectric layer of the capacitor. The magnetization orientation of the IPA ferromagnet can represent the logic state of the valleytronic MESO device. A spin-to-charge conversion output module comprises a ferromagnet possessing perpendicular magnetic anisotropy (PMA) and a 2D valleytronic material. The IMA and PMA ferromagnets are chirally-coupled through Dzaloshinskii-Moriya interaction, which causes the perpendicular magnetic orientation of the PMA ferromagnet to switch with the in-plane magnetization orientation of the IPA ferromagnet. The logic state of the device is read through injection of spin-polarized current from the PMA ferromagnet into the 2D valleytronic layer, which converts the injected spin-polarized current into a differential output current.

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