Orientation and magnetic properties of FePt and CoPt films grown on MgO(110) single-crystal substrate by electron-beam coevaporation

Yu, Miao; Ohguchi, Hiroyuki; Zambano, A.; Takeuchi, Ichiro; Liu, J.P.; Josell, Daniel; Bendersky, Leonid A.

doi:10.1016/j.mseb.2007.07.005

Cited by 26 publications

(21 citation statements)

References 9 publications

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“…Although a combinatorial approach, where a large number of samples are synthesized in a single experiment, processed, and then rapidly characterized in parallel, [17][18][19][20][21][22][23] has the potential to significantly expedite the discovery of new hydrogen storage materials, only a few groups have adopted it so far. [24][25][26][27][28] In large part, the hesitance to this new methodology is based on the lack of an effective screening technique, frequently the bottleneck for new combinatorial studies.…”

Section: -16mentioning

confidence: 99%

An infrared imaging method for high-throughput combinatorial investigation of hydrogenation-dehydrogenation and new phase formation of thin films

Oguchi

Hattrick‐Simpers

Takeuchi

et al. 2009

Review of Scientific Instruments

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Positron depth profiling of the structural and electronic structure transformations of hydrogenated Mg-based thin films J. Appl. Phys. 105, 043514 (2009) We have developed an infrared imaging setup enabling in situ infrared images to be acquired, and expanded on capabilities of an infrared imaging as a high-throughput screening technique, determination of a critical thickness of a Pd capping layer which significantly blocks infrared emission from below, enhancement of sensitivity to hydrogenation and dehydrogenation by normalizing raw infrared intensity of a Mg thin film to an inert reference, rapid and systematic screening of hydrogenation and dehydrogenation properties of a Mg-Ni composition spread covered by a thickness gradient Pd capping layer, and detection of formation of a Mg 2 Si phase in a Mg thin film on a thermally oxidized Si substrate during annealing.

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Section: -16mentioning

confidence: 99%

An infrared imaging method for high-throughput combinatorial investigation of hydrogenation-dehydrogenation and new phase formation of thin films

Oguchi

Hattrick‐Simpers

Takeuchi

et al. 2009

Review of Scientific Instruments

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“…This different alignment may explain why there is not a measureable coercivity for the surface biotemplated MNPs when measured in VSM. Hysteresis loops of sputtered CoPt with misaligned grains can show loops with reduced [ 41 ] or no [ 42 ] coercivity depending on the direction in which the external fi eld is applied. As it was only possible to measure the magnetization of the samples in the out-of-plane direction, it may be that the C -axis of the fi lm is aligned in plane, or in some other orientation.…”

Section: Magnetic Properties Of Surface Biotemplated L1 0 Coptmentioning

confidence: 99%

Developing Biotemplated Data Storage: Room Temperature Biomineralization of L1₀CoPt Magnetic Nanoparticles

Galloway

Talbot

Critchley

et al. 2015

Adv Funct Materials

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L10 cobalt platinum can be used to record data at approximately sixfold higher densities than it is possible to on existing hard disks. Currently, fabricating L10 CoPt requires high temperatures (≈500 °C) and expensive equipment. One ecological alternative is to exploit biomolecules that template nanomaterials at ambient temperatures. Here, it is demonstrated that a dual affinity peptide (DAP) can be used to biotemplate L10 CoPt onto a surface at room temperature from an aqueous solution. One part of the peptide nucleates and controls the growth of CoPt nanoparticles from solution, and the other part binds to SiO2. A native silicon oxide surface is functionalized with a high loading of the DAP using microcontact printing. The DAP biotemplates a monolayer of uniformly sized and shaped nanoparticles when immobilized on the silicon surface. X‐ray diffraction shows that the biotemplated nanoparticles have the L10 CoPt crystal structure, and magnetic measurements reveal stable, multiparticle zones of interaction, similar to those seen in perpendicular recording media. This is the first time that the L10 phase of CoPt has been formed without high temperature/vacuum treatment (e.g., annealing or sputtering) and offers a significant advancement toward developing environmentally friendly, biotemplated materials for use in data storage.

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“…34,35 Figures 2͑a͒ and 2͑b͒ show the typical crystal structures of fcc MgO and fct CoPt, respectively. In Fig.…”

Section: The Effect Of Copt Crystallinity and Grain Texturing On Propmentioning

confidence: 99%

The effect of CoPt crystallinity and grain texturing on properties of exchange-coupled Fe/CoPt systems

Oguchi

Zambano

et al. 2009

Journal of Applied Physics

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The effect of the crystallinity and the grain texturing of CoPt hard layers on exchange coupled Fe/CoPt soft/hard magnetic systems was studied using gradient thickness multilayer thin films. We have studied the hard layer structures by transmission electron microscopy and x-ray diffraction, and characterized the exchange coupling interaction through magnetization loops obtained by the magneto-optical Kerr effect measurement. We found that exchange coupling strongly depends on the crystalline characteristics of the CoPt hard layer. There is correlation between the mixture of different grain orientations of the CoPt hard layer and coupling efficiency. In particular, interlayer coupling is enhanced when there is only one orientation, namely, the L10 CoPt structure with its c-axis inclined at 45° with respect to the substrate plane. An increased degree of mixture of the latter with the in-plane-c-axis L10 CoPt structure is detrimental to obtaining one-phase-like magnetization loops. The present work points to the importance of controlling the crystalline properties of the hard layer in order to enhance the maximum energy product (BH)max in hard/soft nanocomposite magnets.

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Orientation and magnetic properties of FePt and CoPt films grown on MgO(110) single-crystal substrate by electron-beam coevaporation

Cited by 26 publications

References 9 publications

An infrared imaging method for high-throughput combinatorial investigation of hydrogenation-dehydrogenation and new phase formation of thin films

An infrared imaging method for high-throughput combinatorial investigation of hydrogenation-dehydrogenation and new phase formation of thin films

Developing Biotemplated Data Storage: Room Temperature Biomineralization of L1₀CoPt Magnetic Nanoparticles

The effect of CoPt crystallinity and grain texturing on properties of exchange-coupled Fe/CoPt systems

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Orientation and magnetic properties of FePt and CoPt films grown on MgO(110) single-crystal substrate by electron-beam coevaporation

Cited by 26 publications

References 9 publications

An infrared imaging method for high-throughput combinatorial investigation of hydrogenation-dehydrogenation and new phase formation of thin films

An infrared imaging method for high-throughput combinatorial investigation of hydrogenation-dehydrogenation and new phase formation of thin films

Developing Biotemplated Data Storage: Room Temperature Biomineralization of L10CoPt Magnetic Nanoparticles

The effect of CoPt crystallinity and grain texturing on properties of exchange-coupled Fe/CoPt systems

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Developing Biotemplated Data Storage: Room Temperature Biomineralization of L1₀CoPt Magnetic Nanoparticles