Abstract
An all-magnetic logic scheme has the advantages of being non-volatile and energy efficient over the conventional transistor based logic devices. In this work, we present a reconfigurable magnetic logic device which is capable of performing all basic logic operations in a single device. The device exploits the deterministic trajectory of domain wall (DW) in ferromagnetic asymmetric branch structure for obtaining different output combinations. The programmability of the device is achieved by using a current-controlled magnetic gate, which generates a local Oersted field. The field generated at the magnetic gate influences the trajectory of the DW within the structure by exploiting its inherent transverse charge distribution. DW transformation from vortex to transverse configuration close to the output branch plays a pivotal role in governing the DW chirality and hence the output. By simply switching the current direction through the magnetic gate, two universal logic gate functionalities can be obtained in this device. Using magnetic force microscopy imaging and magnetoresistance measurements, all basic logic functionalities are demonstrated.
Highlights
An all-magnetic logic scheme has the advantages of being non-volatile and energy efficient over the conventional transistor based logic devices
The output can be programmed by flowing current through a metallic strip which is patterned on top of the structure at the intersection between the horizontal nanowire and the half ring
We have proposed and demonstrated the prototype of all-magnetic reconfigurable logic device by using magnetic force microscopy (MFM) imaging and anisotropic magnetoresistance (AMR) measurements
Summary
An all-magnetic logic scheme has the advantages of being non-volatile and energy efficient over the conventional transistor based logic devices. We present a reconfigurable magnetic logic device which is capable of performing all basic logic operations in a single device. The field generated at the magnetic gate influences the trajectory of the DW within the structure by exploiting its inherent transverse charge distribution. The manipulation of the magnetization direction of nanomagnets, via magnetic field[3,4,5,6,7,8] or spin transfer torque effect[9], has spawned numerous techniques for magnetic logic[3,4,5,6,7,8,9,10,11,12] In these logic schemes, different physical designs are needed for full logic functionalities. The magnetic gate influences the DW trajectory in the network structure by exploiting its inherent transverse charge distribution. By switching the polarity of the magnetic gate, two universal logic functionalities are obtained in this structure
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