Experimental demonstration of current-induced domain wall (DW), i.e., the boundaries between regions of uniform magnetization, motion in ferromagnetic nanowires opens a novel way to store and to manipulate information for computation. Several DW-based device concepts have been proposed to build the energy-efficient and scalable devices. Spin logic devices based on DW motion are promising candidates to continue scaling down the integrated circuit and circumvent the limitation of current CMOS technology related to power dissipation at low dimension. In such devices, the logic information is encoded in the position of a DW while its motion is employed to perform the logic function. Therefore, understanding the dynamics behavior of DW motion and controlling DW speed are critical as it essentially relates to the operational speed of the logic circuit. Recently, the discovery of extremely fast current-driven DW motion and low threshold current in the magnetic materials composed of a very thin ferromagnet sandwiched between a heavy metal and an oxide offers a route towards the realization of the spin logic devices. This remarkable feature is entirely linked to the presence of the interfacial Dzyaloshinskii–Moriya interaction (DMI) and the spin orbit torque (SOT) originating at the interface of heavy metal and ferromagnetic layer.
The goal of this internship will study the effect of DMI and SOT governing the physical process of DW motion in materials with perpendicular magnetic anisotropy in order to achieve fast and reliable current-induced DW motion. The student will fabricate spin logic devices, from micro-down to the nanoscale using cleanroom facilities at IMEC. The DW propagation characteristics in these devices will be studied using magneto-transport measurements and magnetic imaging techniques as Kerr microscopy. A part of the experimental works will be performed in close collaboration with the laboratory in France. The student should have a strong interest in nanofabrication in a cleanroom environment as well as in leading edge research topics on magnetism and magnetic materials.
Type of project: Internship, Thesis, Combination of internship and thesis
Duration: > 6 months
Required degree: Master of Science, Master of Engineering Science
Required background: Materials Engineering, Nanoscience & Nanotechnology, Physics
Imec allowance will be provided