Controlling Spin: Emergent Magnetic Phenomena at Interfaces, Spin Currents and the Future of Spintronics

Wednesday, April 18, 2018, 3:00 - 4:00 pm in 6-2202


Yuri Suzuki
Stanford University

Host: Alpha N'Diaye

The manipulation of the spin degrees of freedom in a solid has been of fundamental and technological interest recently for developing high-speed, low-power computational devices. There has been much work focused on developing highly spin-polarized materials and understanding their behavior when incorporated into so-called spintronic devices. Materials that exhibit perpendicular magnetic anisotropy have been of particular interest for spintronic applications. We have recently discovered that perpendicular magnetic anisotropy emerges at the interfaces of SrIrO3 and manganites La1-xSrxMnO3 for Sr rich compositions. Synchrotron x-ray diffraction and linear dichroism measurements indicate a strong correlation between the PMA and the oxygen octahedral rotations at interfaces. Through x-ray diffraction, SQUID magnetometry as well as x-ray magnetic circular dichroism and x-ray linear dichroism, we have determined that the emergent perpendicular magnetic anisotropy is due to the delicate interplay of charge, spin, orbital and lattice degrees of freedom that is associated with charge transfer at the interfaces. More recently, we have found that this perpendicular magnetic anisotropy is tunable by an external field and therefore is promising for voltage-controlled magnetism. The magnetic tunability is also accompanied by a metal insulator transition that may be promising for switching applications as well. We will also discuss some of our recent work on developing new low loss oxide spinels for spin current generation.

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