Spin structure in perpendicularly magnetized Fe-FePt bilayers

Laenens, Bart; Planckaert, Nikie; Demeter, J.; Trekels, Maarten; Labbé, Caroline; Strohm, C.; Rüffer, R.; Temst, Kristiaan; Vantomme, André; Meersschaut, Johannes

doi:10.1103/physrevb.82.104421

Cited by 22 publications

(17 citation statements)

References 32 publications

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“…In experiments and calculations, the critical thickness of the Fe layer for the transition from rigid magnet to exchange spring magnet regime in Fe/FePt composites is reported to be around 2-3 nm. 33,47 After immersion of the Fe-O/Fe/FePt composite film in 1M KOH and application of −1.26 V and −0.18 V, strong voltage-induced changes of the magnetic hysteresis are observed (Fig. 5).…”

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confidence: 99%

“…In this case, the properties are consistent with the film being in the rigid magnet regime 47 where due to exchange coupling the spin orientation in a soft magnetic Fe layer does not deviate from the FePt spin direction. 33 Schematically, this is illustrated in the respective sketch in Fig. 7.…”

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“…This allows to exploit magnetic exchange coupling at the Fe/L1 0 FePt interface. 33 This way, simultaneous control of both, magnetization and anisotropy, in a well-defined trilayered heterostructure with dominating PMA is achieved.…”

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confidence: 99%

“…The structural data obtained by FFT allow to identify the iron oxide as Fe 3 The oxidized state, exhibiting an Fe/FePt bilayer with 2 nm Fe layer thickness, is at the critical point for the transition from rigid magnet to exchange spring magnet behaviour. 33,47 This allows to discuss the observed large voltage-induced changes in anisotropy by a combination of MI effects at the Fe-O/Fe surface with exchange coupling at the Fe/FePt interface. As discussed for single Fe-O/Fe films, voltage-induced reduction and oxidation will cause a variation of the metallic Fe layer thickness.…”

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Research Update: Magnetoionic control of magnetization and anisotropy in layered oxide/metal heterostructures

et al. 2016

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Electric field control of magnetization and anisotropy in layered structures with perpendicular magnetic anisotropy is expected to increase the versatility of spintronic devices. As a model system for reversible voltage induced changes of magnetism by magnetoionic effects, we present several oxide/metal heterostructures polarized in an electrolyte. Room temperature magnetization of Fe-O/Fe layers can be changed by 64% when applying only a few volts in 1M KOH. In a next step, the bottom interface of the in-plane magnetized Fe layer is functionalized by an L10 FePt(001) underlayer exhibiting perpendicular magnetic anisotropy. During subsequent electrocrystallization and electrooxidation, well defined epitaxial Fe3O4/Fe/FePt heterostructures evolve. The application of different voltages leads to a thickness change of the Fe layer sandwiched between Fe-O and FePt. At the point of transition between rigid magnet and exchange spring magnet regime for the Fe/FePt bilayer, this induces a large variation of magnetic anisotropy.

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Research Update: Magnetoionic control of magnetization and anisotropy in layered oxide/metal heterostructures

et al. 2016

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“…Noteworthy examples include the use of SR to study thin films, interfaces, and surfaces 37,[39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54] in a superconductor 55) and in high-pressure experiments, [56][57][58][59] as well as spin ice 60) and diffusion. [61][62][63][64][65][66][67][68][69] The application of external perturbations that are synchronized to the pulse timing of SR is a unique method.…”

Section: Energy Domain Measurementmentioning

confidence: 99%

Condensed Matter Physics Using Nuclear Resonant Scattering

Seto

2013

J. Phys. Soc. Jpn.

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Mössbauer spectroscopy is a powerful and well-established method used in a wide variety of scientific applications. An outstanding feature of this method is that element specific information on electronic and phonon states can be obtained. The use of high-brilliance synchrotron radiation as an excitation source for Mössbauer measurements enables measurements to be recorded under extreme conditions such as high pressures, very high or very low temperatures, and strong external magnetic fields. In addition, the tunability of synchrotron radiation energy allows a wide range of nuclides to be used. Moreover, the use of synchrotron radiation enables the measurement of the element-and sitespecific phonon density of states. Another unique property of the method is the narrow energy width of the nuclear excited states, due to which the method is an effective tool for studying the slow dynamics of soft matter and glass transitions. The concepts and methods involved in these measurements are introduced and discussed, and the unique features of the methods are highlighted.

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