Graphene and Proximitronics



Graphene is a very promising material for the development of spintronic devices. Spintronic devices use the intrinsic angular momentum of electrons to transmit and process data. There is a new approach to create and observe spins. It relies on how close graphene is to a nearby material. The approach is difficult. 

Scientists at CIC nanoGUNE BRTA have created a spintronic device that leverages proximity effects alone. It is essentially a 2-D graphene based spin valve. The paper was published in Nature Electronics.

Haozhe Yang his first author of the paper. He reported in a recent interview, “ The field of spintronics has evolved significantly since the pioneering discoveries of spin injection and giant magnetoresistance in the 1980s. These discoveries, which relied on spin polarized electron injection in a 3-D structure from a ferromagnetic metal to a normal metal earned Albert. Fert and Peter Grunberg The 2007 Nobel prize in physics. Their groundbreaking achievement laid the foundation for ongoing research in the complex, material combinations and interface optimization techniques.”

Yang and his colleagues realized the first ever seamless 2-D spintronic device. The team could enable the manipulation and transport of spin in all the 2-D plane.

The spin valve is a step forward over older spintronic components. Namely, the lack of physical interfaces between the components equates to a more effective device.

Yang reports, “ Our experiments revealed that proximitized graphene, the central component of this all 2-D spin valve, exhibits a coexistence of spin – orbit and magnetic proximity effects. This seamless structure strongly demonstrates the feasibility of using the proximity effect to develop essential electronic devices.” 

The team's initial testing is very promising. It shows spin orbit and magnetic exchange coupling at the same time. This created a large size anomalous Hall effect. The team hopes to build new spintronic devices in the future, called “proximitronics.”

Yang summarizes, “ We believe the simple yet innovative all proximitized spintronic device will inspire further research in the fundamental mechanisms and applications of the proximity effect. Its Significance could extend beyond spintronics, potentially forming the basis for a new research field. Our immediate goal is to deepen the understanding of proximitized systems and explore their integration into advanced, electronic and spintronic applications."

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