Ferromagnetic strip domains in an atomic monolayer

Yafet, Y.; Gyorgy, E. M.

doi:10.1103/physrevb.38.9145

Cited by 291 publications

(184 citation statements)

References 11 publications

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“…2e-h shows histograms of the angle a at DW sections with corresponding orientations. Key points for these data demonstrated are as follows: when DW tangential direction is parallel to [1][2][3][4][5][6][7][8][9][10], that is, f ¼ 0°±3°, then the histogram plotted in Fig. 2e shows that the angle a is scattered about a narrow distribution centred near 0°, confirming that these DWs are Néel type with left-handed chirality 17 .…”

Section: Resultsmentioning

confidence: 70%

“…2g, where a peak showing a narrow distribution of the angle a appears at B þ 45°. Although this is clearly a chiral spin structure, it neither corresponds to chiral Néel wall [15][16][17] nor to non-chiral Bloch wall [1][2][3]16,17 . This DW spin texture can be understood as a superposition of the lefthanded chiral Néel structure and left-handed chiral Bloch structure, that is, as in Néel walls the spin vector tilts towards the in-plane normal direction of the DW while, at the same time, it rotates around the DW normal as it does in Bloch walls.…”

Section: Resultsmentioning

confidence: 99%

“…2a, and a typical compound SPLEEM image (see Methods) is shown in Fig. 2b where blue/yellow indicates magnetization components along [1][2][3][4][5][6][7][8][9][10] Fig. 2b, we notice that all DWs are either cyan or red, which means that the in-plane components of all DWs are either parallel or antiparallel to W[001], even though the directions of DWs are oriented along all possible directions within the film plane.…”

Section: Resultsmentioning

confidence: 99%

“…In non-chiral films, both rotation senses exist in different sections of DWs, with the same probability overall. The conventional textbook view predicts non-chiral Bloch walls as the ground state in magnetic thin films [1][2][3] . In this picture chirality, that is, one preferred spin rotational sense in DWs, does not emerge because the magnetic energy contributions are all symmetric with respect to the rotation direction between to spins.…”

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Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain

et al. 2015

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Chiral magnetic domain walls are of great interest because lifting the energetic degeneracy of left-and right-handed spin textures in magnetic domain walls enables fast current-driven domain wall propagation. Although two types of magnetic domain walls are known to exist in magnetic thin films, Bloch-and Néel-walls, up to now the stabilization of homochirality was restricted to Néel-type domain walls. Since the driving mechanism of thin-film magnetic chirality, the interfacial Dzyaloshinskii-Moriya interaction, is thought to vanish in Bloch-type walls, homochiral Bloch walls have remained elusive. Here we use real-space imaging of the spin texture in iron/nickel bilayers on tungsten to show that chiral domain walls of mixed Bloch-type and Néel-type can indeed be stabilized by adding uniaxial strain in the presence of interfacial Dzyaloshinskii-Moriya interaction. Our findings introduce Bloch-type chirality as a new spin texture, which may open up new opportunities to design spin-orbitronics devices.

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Section: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain

et al. 2015

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“…Such a description of the domain-wall profile has been already used by Yafet and Gyorgy in Ref. 33. However, they can analyze the magnetostatic energy only for a thickness that is much smaller than the domain width.…”

Section: Theoretical Modelmentioning

confidence: 99%

Magnetic anisotropy in epitaxial Mn5Ge3films

et al. 2012

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Analysis of Magnetic Domain Sizes in Ultrathin Ferromagnetic Films

Maziewski

Zablotskii

Kisielewski

2002

phys. stat. sol. (a)

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Ultrathin magnetic films are considered where the thickness-induced second order phase transition occurs due to surface magnetic anisotropy changes. By increasing the thickness, the easy magnetization axis state passes through the easy cone state (for film thickness t: t 1 < t < t 2 ) into the easy magnetization plane state. The characteristic material length l c (defined as the ratio of the domain wall energy density to the demagnetization energy) was calculated up to thickness t 2 . The exact determination of stripe domain period, p, was proposed, applying the transcendent Lerch functions to the classical Kooy-Enz model. Near t 2 where l c vanishes, the critical period, p c , was also discussed. Considering real sets of material parameters taken for ultrathin cobalt films, it was found that by increasing the thickness, the equilibrium domain period drastically decreases from practically infinity (many kilometers for t = 0.5 nm) into the nanometer scale near t 2 .The changes of magnetic domain sizes with film thickness and especially in the vicinity of the reorientation phase transition (RPT) are still of great and current interest [1][2][3][4]. For both application and theory it is important to understand the physical mechanisms leading to the formation of domain structures and determining the observed variety of their sizes. A sharp decrease in domain sizes was found experimentally in the vicinity of the RPT [3,4] in Co/Au ultrathin wedges. Small domains in the nanometer scale were observed in the reorientation region.Analysis of equilibrium stripe domain structures was based in the present work on calculations of: (i) the domain period considering the classical parameter, called the material length l c = g w /(m 0 M s 2 ), where M s is the saturation magnetization, and g w is the wall energy, and (ii) l c which is dependent on thickness-induced magnetic anisotropy changes.Let us consider a stripe domain structure in an ultrathin film where the easy axis is perpendicular to the surface. Stripe domain period, p, is usually determined minimizing the total surface energy density of the domain structure -the sum of the domain wall and the demagnetization energies E = E w + E m . The domain wall energy density one can easy calculate as E w = m 0 M s 2 l c x/y, where x = t/l c and y = p/l c . More complicated is the demagnetization energy calculation. The structure can be described by the classical Kooy-Enz theory [5,6] giving E m in the form of infinite series which are slowly convergent, especially for the smallest film thickness. This was the reason for making some approximations, e.g. [2]. We propose to perform exact E m calculations using the transcendent Lerch functions. These functions are easily available in typical program

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Ferromagnetic strip domains in an atomic monolayer

Cited by 291 publications

References 11 publications

Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain

Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain

Magnetic anisotropy in epitaxial Mn5Ge3films

Analysis of Magnetic Domain Sizes in Ultrathin Ferromagnetic Films

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