Probing the spinor nature of electronic states in nanosize non-collinear magnets

Fischer, Jeison A.; Sandratskii, L. M.; Phark, Soo-hyon; Ouazi, S.; Pasa, André A.; Sander, Dirk; Parkin, Stuart S. P.

doi:10.1038/ncomms13000

Cited by 7 publications

(9 citation statements)

References 42 publications

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“…8b. The wavelength of the stripe pattern, as denoted, is identical with that (1.28 nm) observed in the pure Fe island [7, 20]. Figure 8e shows a zoom-in of the field dependence between two maxima in the profiles, as shown within the grey dashed line in Fig.…”

Section: Spin-stm With Quantitatively Characterized Magnetic Tipssupporting

confidence: 65%

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Spin-polarized scanning tunneling microscopy with quantitative insights into magnetic probes

Phark

Sander

2017

Nano Convergence

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Spin-polarized scanning tunneling microscopy and spectroscopy (spin-STM/S) have been successfully applied to magnetic characterizations of individual nanostructures. Spin-STM/S is often performed in magnetic fields of up to some Tesla, which may strongly influence the tip state. In spite of the pivotal role of the tip in spin-STM/S, the contribution of the tip to the differential conductance dI/dV signal in an external field has rarely been investigated in detail. In this review, an advanced analysis of spin-STM/S data measured on magnetic nanoislands, which relies on a quantitative magnetic characterization of tips, is discussed. Taking advantage of the uniaxial out-of-plane magnetic anisotropy of Co bilayer nanoisland on Cu(111), in-field spin-STM on this system has enabled a quantitative determination, and thereby, a categorization of the magnetic states of the tips. The resulting in-depth and conclusive analysis of magnetic characterization of the tip opens new venues for a clear-cut sub-nanometer scale spin ordering and spin-dependent electronic structure of the non-collinear magnetic state in bilayer high Fe nanoislands on Cu(111).

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Section: Spin-stm With Quantitatively Characterized Magnetic Tipssupporting

confidence: 65%

“…h A dI/dV map calculated from the d I /d V images of f and g . b – d Reprinted from [18] with permission from Institute of Physics (Copyright 2014). f – h Reprinted from [20] with permission from Nature Publishing Group (Copyright 2016) …”

Section: Spin-stm With Quantitatively Characterized Magnetic Tipsmentioning

confidence: 99%

Spin-polarized scanning tunneling microscopy with quantitative insights into magnetic probes

Phark

Sander

2017

Nano Convergence

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“…Skyrmions [3,4] form a specific class of noncollinear spin structures, reminiscent of magnetic vortices. They hold big promise for future spintronic applications, including racetrack memories and logic devices [5]. They are further discussed in section 4.…”

Section: Max Planck Institute Of Microstructure Physicsmentioning

confidence: 99%

“…What are the underlying physical principles which drive the distortion on the atomic scale of a spatially confined non-collinear spin texture (NCST) in proximity to interfaces with a ferromagnet (FM) and vacuum (VAC)? Example: helical spin structure of wavelength 1.4 nm in a Fe bilayer (orange), confined between a Co bilayer (blue, left) and vacuum (grey, right) [5]. The helical spin texture (red arrows) with spin rotation of 45 degree between adjacent atomic sites is distorted in proximity (green) to the interfaces.…”

Section: Max Planck Institute Of Microstructure Physicsmentioning

confidence: 99%

The 2017 Magnetism Roadmap

Sander

Valenzuela

Makarov

et al. 2017

J. Phys. D: Appl. Phys.

323

207

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Building upon the success and relevance of the 2014 Magnetism Roadmap, this 2017 Magnetism Roadmap edition follows a similar general layout, even if its focus is naturally shifted, and a different group of experts and, thus, viewpoints are being collected and presented. More importantly, key developments have changed the research landscape in very relevant ways, so that a novel view onto some of the most crucial developments is warranted, and thus, this 2017 Magnetism Roadmap article is a timely endeavour. The change in landscape is hereby not exclusively scientific, but also reflects the magnetism related industrial application portfolio. Specifically, Hard Disk Drive technology, which still dominates digital storage and will continue to do so for many years, if not decades, has now limited its footprint in the scientific Topical ReviewOriginal content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. and research community, whereas significantly growing interest in magnetism and magnetic materials in relation to energy applications is noticeable, and other technological fields are emerging as well. Also, more and more work is occurring in which complex topologies of magnetically ordered states are being explored, hereby aiming at a technological utilization of the very theoretical concepts that were recognised by the 2016 Nobel Prize in Physics.Given this somewhat shifted scenario, it seemed appropriate to select topics for this Roadmap article that represent the three core pillars of magnetism, namely magnetic materials, magnetic phenomena and associated characterization techniques, as well as applications of magnetism. While many of the contributions in this Roadmap have clearly overlapping relevance in all three fields, their relative focus is mostly associated to one of the three pillars. In this way, the interconnecting roles of having suitable magnetic materials, understanding (and being able to characterize) the underlying physics of their behaviour and utilizing them for applications and devices is well illustrated, thus giving an accurate snapshot of the world of magnetism in 2017.The article consists of 14 sections, each written by an expert in the field and addressing a specific subject on two pages. Evidently, the depth at which each contribution can describe the subject matter is limited and a full review of their statuses, advances, challenges and perspectives cannot be fully accomplished. Also, magnetism, as a vibrant research field, is too diverse, so that a number of areas will not be adequately represented here, leaving space for further Roadmap editions in the future. However, this 2017 Magnetism Roadmap article can provide a frame that will enable the reader to judge where each subject and magnetism research field stands overall today and which directions it might take in the foreseeable future.The first mater...

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“…Large magnetic moment materials are essential components in a variety of technologies but are increasingly important and in many cases the major limiting factor in information processing and data storage. 1,2 For ultrathin film application, large moments are particularly important in high-density memory applications, 3 spin torque hierarchies, 4 BH-energy product device structures, 5 the control of spinor applications in nanoscale non-collinear magnets, 6 and establishing enhanced electron spin-polarizations at the Fermi level. 7 Increasing the average atomic moment of these films can significantly improve their performance.…”

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confidence: 99%

Large moments in bcc FexCoyMnz ternary alloy thin films

Snow

Bhatkar

N’Diaye

et al. 2018

Applied Physics Letters

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The elemental magnetic moments and the average atomic moment of 10-20 nm thick single crystal bcc (bct) Fe x Co y Mn z films deposited on MgO(001) have been determined as a function of a broad range of compositions. Thin film epitaxy stabilized the bcc structure for 80% of the available ternary compositional space compared to only a 23% stability region for the bulk. The films that display ferromagnetism represent 60% of the available compositional possibilities compared to 25% for the bulk. A maximum average atomic moment of 3.25 6 0.3 l B /atom was observed for a bcc Fe 9 Co 62 Mn 29 film (well above the limit of the Slater-Pauling binary alloy curve of 2.45 l B /atom). The Fe x Co y Mn z ternary alloys that exhibit high moments can only be synthesized as ultrathin films since the bcc structure is not stable in the bulk for those compositions.

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Probing the spinor nature of electronic states in nanosize non-collinear magnets

Cited by 7 publications

References 42 publications

Spin-polarized scanning tunneling microscopy with quantitative insights into magnetic probes

Spin-polarized scanning tunneling microscopy with quantitative insights into magnetic probes

The 2017 Magnetism Roadmap

Large moments in bcc FexCoyMnz ternary alloy thin films

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