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      Studies of nanomagnetism using synchrotron-based x-ray photoemission electron microscopy (X-PEEM)

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      Reports on Progress in Physics

      IOP Publishing

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          Giant Magnetoresistance of (001)Fe/(001)Cr Magnetic Superlattices

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            Magnetic domain-wall racetrack memory.

            Recent developments in the controlled movement of domain walls in magnetic nanowires by short pulses of spin-polarized current give promise of a nonvolatile memory device with the high performance and reliability of conventional solid-state memory but at the low cost of conventional magnetic disk drive storage. The racetrack memory described in this review comprises an array of magnetic nanowires arranged horizontally or vertically on a silicon chip. Individual spintronic reading and writing nanodevices are used to modify or read a train of approximately 10 to 100 domain walls, which store a series of data bits in each nanowire. This racetrack memory is an example of the move toward innately three-dimensional microelectronic devices.
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              Epitaxial BiFeO3 multiferroic thin film heterostructures.

              Enhancement of polarization and related properties in heteroepitaxially constrained thin films of the ferroelectromagnet, BiFeO3, is reported. Structure analysis indicates that the crystal structure of film is monoclinic in contrast to bulk, which is rhombohedral. The films display a room-temperature spontaneous polarization (50 to 60 microcoulombs per square centimeter) almost an order of magnitude higher than that of the bulk (6.1 microcoulombs per square centimeter). The observed enhancement is corroborated by first-principles calculations and found to originate from a high sensitivity of the polarization to small changes in lattice parameters. The films also exhibit enhanced thickness-dependent magnetism compared with the bulk. These enhanced and combined functional responses in thin film form present an opportunity to create and implement thin film devices that actively couple the magnetic and ferroelectric order parameters.
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                Author and article information

                Journal
                Reports on Progress in Physics
                Rep. Prog. Phys.
                IOP Publishing
                0034-4885
                1361-6633
                February 01 2012
                February 01 2012
                : 75
                : 2
                : 026501
                Article
                10.1088/0034-4885/75/2/026501
                © 2012

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