Observation of the topological Hall effect and signature of room-temperature antiskyrmions in Mn-Ni-Ga 
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 Heusler magnets

Sen, Subir; Singh, Charanpreet; Mukharjee, Prashanta K.; Nath, R.; Nayak, Ajaya K.

doi:10.1103/physrevb.99.134404

Cited by 30 publications

(32 citation statements)

References 57 publications

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“…We add the comment on Mn-based Heusler compounds, which show a rich variety of physical properties such as the topological Hall effect, shape-memory and so on [54][55][56]. While many Mnbased Heusler compounds show ferromagnetism, a Heusler compound, allowing interstitial atoms, has not been reported to our knowledge.…”

Section: Brief Summary Of Mn-based Compoundsmentioning

confidence: 96%

Interstitial Atom Engineering in Magnetic Materials

Kitagawa

Sakaguchi

Hara

et al. 2020

Metals

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Interstitial light elements play an important role in magnetic materials by improving the magnetic properties through changes of the unit cell volume or through orbital hybridization between the magnetic and interstitial atoms. In this review focusing on the effects of interstitial atoms in Mn-based compounds, which are not well researched, the studies of interstitial atoms in three kinds of magnetic materials (rare-earth Fe-, Mn-, and rare-earth-based compounds) are surveyed. The prominent features of Mn-based compounds are interstitial-atom-induced changes or additional formation of magnetism—either a change from antiferromagnetism (paramagnetism) to ferromagnetism or an additional formation of ferromagnetism. It is noted that in some cases, ferromagnetic coupling can be abruptly caused by a small number of interstitial atoms, which has been overlooked in previous research on rare-earth Fe-based compounds. We also present candidates of Mn compounds, which enable changes of the magnetic state. The Mn-based compounds are particularly important for the easy fabrication of highly functional magnetic devices, as they allow on-demand control of magnetism without causing a large lattice mismatch, among other advantages.

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Section: Brief Summary Of Mn-based Compoundsmentioning

confidence: 96%

Interstitial Atom Engineering in Magnetic Materials

Kitagawa

Sakaguchi

Hara

et al. 2020

Metals

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“…[30] Besides, magnetic antiskyrmions as topologically nontrivial chiral spin quasiparticles that are now found in several tetragonal Heusler materials. [66,67] Meanwhile, the anisotropic DMI with opposite signs along two orthogonal in-plane directions are responsible for the stabilization of the magnetic antiskyrmions. Our results present an approach to the realization of anisotropic DMI, which would make the implementation of the antiskyrmions possible in magnetic multilayers.…”

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confidence: 99%

Néel‐Type Elliptical Skyrmions in a Laterally Asymmetric Magnetic Multilayer

Cui

Shao

et al. 2021

Advanced Materials

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Magnetic skyrmions, topological chiral spin textures, have aroused extensive research interests due to their intriguing topology-related physics and promising applications in spintronic devices. [1-4] In most cases, skyrmions' chiral spin textures are mainly determined by the Dzyaloshinskii-Moriya interaction (DMI), [5-7] which favors a non-collinear spin configuration between neighboring spins. The appearance of DMI is a direct consequence of spin-orbit coupling and inversion symmetry breaking. [8-10] Depending on the structural symmetry of materials, DMI favors spin arrangement with specific symmetries. For example, natural inversion symmetry breaking in singlecrystal materials, such as MnSi, [11-13] FeCoSi, [14,15] FeGe, [16] and Cu 2 OSeO 3 , [17,18] leads to the emergence of bulk-type DMI Magnetic skyrmions, topological-chiral spin textures, have potential applications in next-generation high-density and energy-efficient spintronic devices for information storage and logic technologies. Tailoring the detailed spin textures of skyrmions is of pivotal importance for tuning skyrmion dynamics, which is one of the key factors for the design of skyrmionic devices. Here, the direct observation of parallel aligned elliptical magnetic skyrmions in Pt/Co/Ta multilayers with an oblique-angle deposited Co layer is reported. Domain wall velocity and spin-orbit-torque-induced out-of-plane effective field analysis demonstrate that the formation of unusual elliptical skyrmions is correlated to the anisotropic effective perpendicular magnetic anisotropy energy density (K eff u) and Dzyaloshinskii-Moriya interaction (DMI) in the film plane. Structural analysis and first-principles calculations further show that the anisotropic K eff u and DMI originate from the interfacial anisotropic strain introduced by the oblique-angle deposition. The work provides a method to tune the spin textures of skyrmions in magnetic multilayers and, thereby, a new degree of freedom for the design of skyrmionic devices.

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“…For further verification of the observed transitions in the M (H) measurements, we have carried out magnetic field dependent ac susceptibility measurements χ (H) at various temperatures from T = 10 K to T = 300 K as depicted in Figure 2(g). The χ (H) data taken at 10 K exhibit a typical ferromagnetic like feature, whereas the measurement at 100 K shows an additional hump like anomaly that persists for the χ (H) data measured at 200 K and 300 K. It is important to mention here that the presence of transition like anomaly in the χ (H) data has been extensively used as a tool to indirectly probe the skyrmion phase in several skyrmion hosting materials [17,[27][28][29][30][31]. Hence, the magnetic phase transitions found in the isothermal magnetization as well as in the ac susceptibility measurements suggest the existence of a possible skyrmion phase above T SR in the present system.…”

Section: Resultsmentioning

confidence: 90%

Uncovering the skyrmion bubble magnetic states in centrosymmetric kagome magnet Mn4Ga2Sn

Chakrabartty,

Jamaluddin,

Manna

et al. 2021

Preprint

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The successful realization of skyrmion based next generation spintronic devices greatly depends on the easy manipulation of underlying magnetic interactions in the skyrmion hosting materials. In this direction, although the mechanism of skyrmion formation in non-centrosymmetric magnets is comprehensively established, contradicting views on the stabilization process of skyrmion/bubble magnetic states in centrosymmetric magnets need further investigation. Here, we report the finding of a tunable skyrmion lattice up to room temperature in a new skyrmion hosting centrosymmetric kagome ferromagnet Mn4Ga2Sn. Using an extensive Lorentz transmission electron microscopy experiment at different temperatures, we demonstrate that both the Bloch-type skyrmions and type-II magnetic bubbles can be stabilized depending upon the nature of magnetic field excitation and strength of uniaxial magnetic anisotropy in the system. Most importantly, we illustrate a controlled switching between the topological skyrmions and the non-topological type-II magnetic bubbles by applying a small in-plane magnetic field. Our results categorically establish that the topological Bloch-type skyrmions are the energetically most stable magnetic objects in the centrosymmetric hexagonal magnets, whereas the type-II magnetic bubbles, instead of biskyrmions, are the excited magnetic states in the system. The present study is an important step towards the basic understanding of the skyrmion stabilization mechanism in centrosymmetric materials and paves the way for their future application in spintronics.

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Observation of the topological Hall effect and signature of room-temperature antiskyrmions in Mn-Ni-Ga D2d Heusler magnets

Cited by 30 publications

References 57 publications

Interstitial Atom Engineering in Magnetic Materials

Interstitial Atom Engineering in Magnetic Materials

Néel‐Type Elliptical Skyrmions in a Laterally Asymmetric Magnetic Multilayer

Uncovering the skyrmion bubble magnetic states in centrosymmetric kagome magnet Mn4Ga2Sn

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