Traditional electric motors rapidly lose power density as their size decreases. Motors on the order of 1 cubic micron , roughly the size of a red blood cell, have nearly six orders of magnitude smaller power densities than cubic millimeter sized motors. Strain-mediated multiferroic motors have recently been predicted to be energy efficient and power dense at the micron scale. These motors leverage magnetoelastic anisotropy to control the magnetic moments of small nanodiscs or domain walls, and use dipolar forces to couple rotors or beads to the stray magnetic field. While deterministic control methods have already been proposed, a variety of device designs and motor concepts abound. This presentation will explore the relative merits of two key linear motor designs; one using individual magnetic nano-islands, and another focusing on propagating Bloch-type domain wall motion in structures analogous to magnetic ‘racetrack’ memory. A combination of Stoner-Wohlfarth magnetic macrospin modeling and numerical FEA simulations fully coupling micromagnetics and elastodynamics will be presented and analyzed. Results demonstrate the racetrack design is capable of applying larger forces to dipole coupled magnetic beads, but that the use of nano-islands may be capable of achieving higher linear velocities due to domain wall speed limits in the racetrack design.
John P. Domann, "Microscale multiferroic motors (Conference Presentation)," Proc. SPIE 10595, Active and Passive Smart Structures and Integrated Systems XII, 105951N (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 08, 2018; Published: 3 April 2018); https://doi.org/10.1117/12.2296643.5763073632001.
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