Journal ArticleDOI
Crystalline structure and magnetic properties of structurally ordered cobalt–iron alloys grown on Bi-containing topological insulators and systems with giant Rashba splitting
A. K. Kaveev,N.S. Sokolov,Sergey M. Suturin,N.S. Zhiltsov,V. A. Golyashov,Konstantin A. Kokh,Igor P. Prosvirin,Oleg E. Tereshchenko,Masahiro Sawada +8 more
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In this article, a body-centered cubic-type (bcc) crystalline structure of CoFe(B) with the (111) plane parallel to the (0001) plane of Bi2Te3 was observed.Abstract:
Epitaxial Co40Fe40B20 and Co55Fe45 (further – CoFe(B)) films were grown on Bi2Te3(0001) and Bi2Se3(0001) substrates by the laser molecular beam epitaxy (LMBE) technique at 200–400 °C. Structurally ordered ferromagnetic thin films were obtained on topological insulator surfaces for the first time. A body-centered cubic-type (bcc) crystalline structure of CoFe(B) with the (111) plane parallel to the (0001) plane of Bi2Te3 was observed, in contrast to the polycrystalline CoFe(B) film formed on Bi2Se3(0001) at RT using a high-temperature seeding layer. Using RHEED 3D reciprocal space mapping, the epitaxial relationships for the CoFe(B)/Bi2Te3 heterostructure were revealed. MOKE and AFM measurements showed the isotropic azimuthal in-plane behavior of the magnetization vector in CoFe(B)/Bi2Te3, in contrast to uniaxial magnetic anisotropy observed in CoFe(B)/Bi2Se3. XPS measurements showed a higher stability of CoFe(B) grown on Bi2Te3 towards oxidation, compared to that of CoFe(B) grown on Bi2Se3. XAS and XMCD measurements for both types of concerned nanostructures allowed the calculation of spin and orbital magnetic moments for Co and Fe. Additionally, we have studied the crystalline structure and magnetic properties of the CoFe(B)/BiTeI system with giant Rashba splitting.read more
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Electromotive force and huge magnetoresistance in magnetic tunnel junctions with zinc-blende MnAs nano-magnets
TL;DR: The results strongly support the contention that, in magnetic nanostructures, Faraday's law of induction must be generalized to account for forces of purely spin origin and a huge magnetoresistance of up to 100,000 per cent is observed for certain bias voltages.
Journal ArticleDOI
Recent Progress in Proximity Coupling of Magnetism to Topological Insulators.
Semonti Bhattacharyya,Golrokh Akhgar,Matthew Gebert,Julie Karel,Julie Karel,Mark T. Edmonds,Michael S. Fuhrer +6 more
TL;DR: This review focuses on one strategy: inducing magnetic order in topological insulators by proximity of magnetic materials, which has the capability for room temperature operation, unlocking the potential of magnetic topological phases for applications.
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New Universal Type of Interface in the Magnetic Insulator/Topological Insulator Heterostructures.
TL;DR: It is demonstrated that, instead of a sharp MI/TI interface clearly separating the two subsystems, it is energetically far more favorable to form a built-in interface via insertion of the MI film inside the TI's surface quintuple layer where it forms a bulk-like MI structure that yields the interface electronic structure essentially free of trivial states.
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Ruthenium nanoparticles integrated bimetallic metal-organic framework electrocatalysts for multifunctional electrode materials and practical water electrolysis in seawater.
TL;DR: In this paper , ruthenium-integrating porous bimetallic transition metal nanoarrays are efficiently generated from metal-organic framework-covered three-dimensional platforms such as carbon cloth using a simple solution-based deposition technique followed by calcination.
References
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Experimental confirmation of the X-ray magnetic circular dichroism sum rules for iron and cobalt.
C. T. Chen,Yves Idzerda,Hong-Ji Lin,Neville V. Smith,G. Meigs,E. E. Chaban,G. H. Ho,Eric Pellegrin,Francesco Sette +8 more
TL;DR: The magnetic moments determined from the integrals of these spectra are found to be in excellent agreement (within 3%) for the orbital to spin moment ratios, and in good agreement for the individual moments, with those obtained from Einstein--de Haas gyromagnetic ratio measurements.
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Exploring the microscopic origin of magnetic anisotropies with X-ray magnetic circular dichroism (XMCD) spectroscopy
TL;DR: In this article, a simple ligand field model was developed to visualize the origin of magnetocrystalline anisotropy in terms of the preferred direction of the orbital moment, corresponding to the direction of maximum size.
Journal ArticleDOI
Distinguishing the ultrafast dynamics of spin and orbital moments in solids
Christine Boeglin,Eric Beaurepaire,V. Halté,Victor Lopez-Flores,Christian Stamm,Niko Pontius,Hermann A. Dürr,Hermann A. Dürr,Jean-Yves Bigot +8 more
TL;DR: The important role played by the spin–orbit interaction in the ultrafast laser-induced demagnetization of ferromagnetic films is highlighted, and it is shown that the magneto-crystalline anisotropy energy is an important quantity to consider in such processes.
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Determination of spin- and orbital-moment anisotropies in transition metals by angle-dependent x-ray magnetic circular dichroism.
Joachim Stöhr,H König +1 more
TL;DR: In this article, angle-dependent x-ray absorption spectroscopy in strong magnetic fields is shown to yield precise site specific information about spin and orbital moments in highly anisotropic $3d$ transition metal systems.
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Characterization of growth and crystallization processes in CoFeB /MgO/CoFeB magnetic tunnel junction structure by reflective high-energy electron diffraction
TL;DR: In this paper, reflective high-energy electron diffraction observations were performed to investigate the growth and crystallization processes of Co60Fe20B20∕MgO∕Co60Fe 20B20 magnetic tunnel junction structures.