Magnetic materials with strong spin-lattice coupling are a powerful set of candidates for multifunctional applications because of their multiferroic, magnetocaloric (MCE), magnetostrictive and magnetoresistive effects. In these materials there is a strong competition between two states (where a state comprises an atomic and an associated magnetic structure) that leads to the occurrence of phase...

Iron-gallium alloys can produce magnetostrictions of 400 ppm and might serve as mechanically robust actuator/sensing materials. However, for polycrystalline Fe–Ga alloys, the magnetostrictive performance decreases with the increasing deviations from the ideal 100 texture. In this paper, three directionally solidified Fe–Ga alloys with gallium contents of 17, 18.4, and 19.5 at. % were characteri...

Dynamical backaction resulting from radiation pressure forces in optomechanical systems has proven to be a versatile tool for manipulating mechanical vibrations. Notably, dynamical resulted the cooling of resonator its ground-state, driving phonon lasing, generation entangled states, and observation optical-spring effect. In certain magnetic materials, vibrations can interact with excitations (...

We experimentally and analytically investigate laser excitation of picosecond longitudinal shear acoustic pulses in highly magnetostrictive terfenol-${\mathrm{TbFe}}_{2}$-epitaxial thin films. report a magnetoelastic mechanism for strain excitation, so-called direct transient demagnetostriction, which denotes the ultrafast laser-induced demagnetization release static built-in strains. From anal...

Carbon fibre reinforced polymers composites possess properties that outstrip their component parts, and are seeing increased adoption in sectors such as the aerospace industry. Due to complex failure mechanisms, it is necessary have structural health monitoring (SHM) place. Previous work has shown efficacy of magnetostrictive materials damage detection actuators; issues spatial sensitivity requ...

Title of Dissertation: Control of Smart Actuators Xiaobo Tan, Doctor of Philosophy, 2002 Dissertation directed by: Professor John S. Baras Professor P. S. Krishnaprasad Department of Electrical and Computer Engineering Hysteresis in smart materials hinders wider applicability of such materials in actuators and sensors. In this dissertation we study modeling, identification and control of hyster...

Nano- and micro-electromechanical systems (N/MEMSs) are traditionally based on electrostatic or piezoelectric coupling, which couples electrical mechanical energy through acoustic resonator structures. Most recently, N/MEMS devices magnetoelectrics gaining much attention. Unlike that rely an AC electric field voltage excitation, magnetoelecric the electromechanical resonance of a magnetostricti...

The aim of this work is to present new variational-based computational modeling approaches for selected materials that have coupled magnetic and mechanical properties. In order to solve the magnetomechanically coupled boundary value problems, we employ the finite element method and also discuss certain aspects that are peculiar to magnetomechanical problems such as the unity constraint on the m...