Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion

Lepadatu, Serban; Saarikoski, Henri; Beacham, Robert; Benitez, M. J.; Moore, T. A.; Burnell, Gavin; Sugimoto, Satoshi; Yesudas, Daniel; Wheeler, May; Miguel, J.; Dhesi, S. S.; McGrouther, Damien; McVitie, S.; Tatara, Gen; Marrows, C. H.

doi:10.1038/s41598-017-01748-7

Cited by 35 publications

(32 citation statements)

References 60 publications

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“…Of recent interest from the viewpoint of low current operation is to use multilayer structures. For instance, heavy metal layers turned out to lower the threshold current by exerting a torque as a result of spin Hall effect (Emori et al, 2013), and synthetic antiferromagnets turned out to be suitable for fast domain wall motion at low current (Saarikoski et al, 2014;Yang et al, 2015;Lepadatu et al, 2017).…”

Section: Threshold Current For Domain Wall Motionmentioning

confidence: 99%

Effective gauge field theory of spintronics

Tatara

2019

Physica E: Low-dimensional Systems and Nanostructures

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The aim of this paper is to present a comprehensive theory of spintronics phenomena based on the concept of effective gauge field, the spin gauge field. An effective gauge field generally arises when we change a basis to describe system and describes low energy properties of the system. In the case of ferromagnetic metals we consider, it arises from structures of localized spin (magnetization) and couples to spin current of conduction electron. The first half of the paper is devoted to quantum mechanical arguments and phenomenology. We show that the spin gauge field has adiabatic and nonadiabatic (off-diagonal) components, consisting an SU(2) gauge field. The adiabatic component gives rise to spin Berry's phase, topological Hall effect and spin motive force, while nonadiabatic components are essential for spin-transfer torque and spin pumping effects by inducing nonequilibrium spin accumulation. In the latter part of the paper, field theoretic approaches are described. Dynamics of localized spins in the presence of applied spin-polarized current is studied in a microscopic viewpoint, and current-driven domain wall motion is discussed. Recent developments on interface spin-orbit interaction are also mentioned.

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Section: Threshold Current For Domain Wall Motionmentioning

confidence: 99%

Effective gauge field theory of spintronics

Tatara

2019

Physica E: Low-dimensional Systems and Nanostructures

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“…To date, most experiments on domain walls concerned a single magnetic layer that is subdivided into domains. A new aspect of research in this area is the use of coupled pairs of walls in synthetic antiferromagnets, which give rise to very high DW velocity [54] or depinning at low current density [55]. The wider area of coupled pairs of topological defects is ripe for further exploration.…”

Section: University Of Leedsmentioning

confidence: 99%

The 2017 Magnetism Roadmap

Sander

Valenzuela

Makarov

et al. 2017

J. Phys. D: Appl. Phys.

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326

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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“…We designed a special stripe magnetic wire as schematically illustrated in Figure 1. One end of the stripe magnetic wire is connected to a diamond-shaped pad which acts as a DW injector [4], and the other end is sharply pointed to prevent the nucleation of a DW from this end [5]. Then the different depth trenches were fabricated at the middle of the stripe.…”

Section: Methodsmentioning

confidence: 99%

Control Domain Wall Motion by Different Depth Trenches in Submicron Permalloy Wires

Wu¹,

Yen²

2019

Preprint

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Domain walls were studied for permalloy wires with different depth trenches (500 nm wide, 30 nm thick, 7.5 µm long, the depth of the trench was 0, 4, 5, 8, 10, 12 and 15nm). Permalloy (Ni80Fe20) wires were fabricated by electron beam lithography and Ar ion milling. When the depth of trench is smaller than 12 nm, the switching field (Hs) is increasing with the deeper trench. However, the depth of trench is bigger than half depth of thickness, the Hs is decreasing with the deeper trench. We believed that Hs increased as the trench depth increased was because the magnetic diploes force increased between the magnetic poles on two sides of the trench. The domains of the wires were divided by the trenches and the domain walls were pinned on the trenches these were confirmed by magnetic force microscopy images.

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Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion

Cited by 35 publications

References 60 publications

Effective gauge field theory of spintronics

Effective gauge field theory of spintronics

The 2017 Magnetism Roadmap

Control Domain Wall Motion by Different Depth Trenches in Submicron Permalloy Wires

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