AVS 64th International Symposium & Exhibition
    Magnetic Interfaces and Nanostructures Division Monday Sessions
       Session MI+BI+EM+SA-MoA

Paper MI+BI+EM+SA-MoA11
Magnetization Switching in Ferromagnets by Adsorbed Chiral Molecules without Current or External Magnetic Field

Monday, October 30, 2017, 5:00 pm, Room 11

Session: Role of Chirality in Spin Transport and Magnetism
Presenter: Oren Ben Dor, The Hebrew University of Jerusalem, Israel
Correspondent: Click to Email
Ferromagnets are commonly magnetized by either external magnetic fields or spin polarized currents. The manipulation of magnetization by spin-current occurs through the spin-transfer-torque effect, which is applied, for example, in modern magnetoresistive random access memory. However, the current density required for the spin-transfer torque is of the order of 1×106 A·cm-2, or about 1×1025 electrons·sec-1·cm-2. This relatively high current density significantly affects the devices' structure and performance. Here, we present a new effect – that of magnetization switching of ferromagnetic thin layers that is induced solely by adsorption of chiral molecules. In this case, about 1013 electrons per cm2 are sufficient to induce magnetization reversal. The direction of the magnetization depends on the handedness of the adsorbed chiral molecules. Local magnetization switching is achieved by adsorbing a chiral self-assembled molecular monolayer on a gold-coated ferromagnetic layer with perpendicular magnetic anisotropy. These results present a simple low power magnetization mechanism when operating at ambient conditions.