OSE Seminars
Spin waves: from magnon spintronics to coupling spin qubits in diamond
Presented by Dr. Abdelghani Laraoui, The Center for High Technology and Materials, (CHTM)
Spin waves are dynamic magnetic excitations of a magnetically ordered system. They can be generated by injecting current or microwave, heating up the magnetic material, or exciting it with ultrashort laser pulses. They are already being explored for classical data transport, information storage, and low-energy logical operations. In this talk, I will discuss two applications of spin waves. First, by using Brillouin Light Scattering microscopy, we studied the spatial emission of spin waves induced by injecting a direct current through spin-valve nano-contacts (size < 80 nm). Large current densities can be achieved in the nanocontact area allowing the excitation of nonlinear spin waves, and their efficiency can be enhanced or reduced due to the spin transfer torque effect. This is first step toward the emerging field of magnon spintronics. Then I will explore spinwave-hosting ferromagnetic waveguides as quantum buses to couple distant spin qubits for scalable quantum platform. In particular I will show that magnetostatic surface spin-wave modes excited in yttrium iron garnet disks produce a dramatic amplification of a microwave field created by an adjacent 15-um Au wire. We used this spin-wave-mediated amplification to coherently control nitrogen vacancy center spin qubits in diamond located up to 3 mm away from the microwave source, one order of magnitude further than in previous experiments. The platform has proved to be highly efficient and may enable future applications in spin-based quantum architectures and remote sensing of target electron and nuclear spins.
11:00 am, Thursday, April 4, 2019
Room 101, Center for High Tech Materials
Science and Technology Park - South Campus
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