College of Science

Seminar: Ivan Lisenkov [Winchester Technologies LLC]

Antiferromagnetic spin electronics: a way for faster communications and computing.

Jan 29, 2019 11:00 AM to Jan 29, 2019 12:00 PM at Building 8 - Room 241

Ferromagnetism, which allows for the existence of a spontaneous magnetic moment, has been used by people all over the world. The compass, for example, has been in use for centuries, and computer memory is an example of a modern innovation that relies on ferromagnetism. A counterpart of ferromagnetism, antiferromagnetism, has received only limited attention. In a typical antiferromagnet, the magnetic moments of atoms couple in such a way that their directions alternate from one lattice site to the next, resulting in a zero net spin and, as a result, the absence of stray fields. Therefore, the spin subsystem of antiferromagnets remains “locked” inside and practically inaccessible by external electromagnetic fields. Fortunately, recent breakthroughs in spin electronics (spintronics) opened a way to create pure “spin-currents”: fluxes of spin angular momentum. It has been found that with spin-currents the magnetic subsystem of antiferromagnets can be accessed and manipulated. We show that with spin-current one can “unlock” the unique features of antiferromagnetic materials. Specifically, because the strong exchange interaction between the lattice electrons in antiferromagnetic materials, oscillations with a THz frequency can be excited. We explore how future antiferromagnetic spintronics devices could find application in telecommunications and computing at the THz frequency range.

10:50 a.m. Refreshments

11:00 a.m. Seminar

Building 8 - Room 241

For further information, please call (909) 869-4014