Overview

PMMagnetic materials are increasingly important in the storage industry. Tremendous advancements, largely fueled by the shrinking of magnetic bits, have occurred since the first magnetic hard disks were created in the 1950s. However, progress cannot continue through scaling alone, and thus it is imperative to develop novel magnetic materials to continue the advancement of spin-based devices. This dissertation focuses on novel, functional, and tunable complex chalcogenide and oxide materials. The first area of investigation involves thin films of the complex chalcogenide material CuCr2Se4. This material is promising for spin-based devices. It is theorized to be nearly half-metallic at room temperature, and, unlike oxide materials which are generally insulating, CuCr2Se 4 is a ferromagnetic metal, which could lead to new paradigms for devices. However, thus far it has only been grown in bulk polycrystalline form. In order to successfully incorporate it into spin-based devices, it is necessary to grow it as a thin film, and thus we examine the conditions necessary to grow this material as a thin film for the first time. Additionally, we use electronic structure calculations to study the effect of Se-deficiency. The second area of investigation focuses on the photomagnetic properties of a spinel ferrite, (Mn,Zn,Fe)3O4. Photomagnetism is an example of a multifunctional property where illumination changes the magnetic properties of certain materials. Though this effect has generally been observed only at low temperatures, we exploit the low magnetic anisotropy of (Mn,Zn,Fe) 3O4 to study photomagnetism at and above room temperature. Additionally, using synchrotron radiation techniques, we directly confirm the proposed mechanism for photomagnetism in spinel ferrites. This novel room temperature functionality could pave the way for spin-based devices that are controlled by illumination. The third area of investigation studies the effect of geometrical confinement on La0.7Sr0.3MnO3 nanostructures. La 0.7Sr0.3MnO3 is ferromagnetic at room temperature and promising for spin-based devices. In order to successfully incorporate La0.7Sr0.3MnO3 into devices, it is essential that we understand the magnetic domain structure. In this work, we tune the magnetic domains in nanostructured La0.7Sr0.3MnO 3 by manipulation of the magnetocrystalline, shape, and magnetostatic anisotropies via the substrate and shape and orientation of the nanostructure

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9781243768421

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