Spiral magnetic correlation in cubic MnSi

Shirane, G.; Cowley, R. A.; Majkrzak, C. F.; Sokoloff, J. B.; Pagonis, B.; Perry, C. H.; Ishikawa, Yoshikazu

doi:10.1103/physrevb.28.6251

Cited by 127 publications

(73 citation statements)

References 14 publications

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“…1(c)). The helicity of such a transverse-spiral magnetic structure can be ascertained by the polarized-neutrondiffraction intensity of magnetic satellite reflection [19,20,21,22,23]. The spin helicity is determined by measuring intensities of two magnetic satellites with the polarized neutron spin S n parallel and anti-parallel to the vector chirality C. The first successful control of the spin helicity as demonstrated by a polarized neutron diffraction study was on a spinel crystal of ZnCr 2 Se 4 which was cooled through the helical spin transition point in simultaneously applied magnetic and electric fields [23].…”

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confidence: 99%

Electric Control of Spin Helicity in a Magnetic Ferroelectric

et al. 2007

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Magnetic ferroelectrics or multiferroics, which are currently extensively explored, may provide a good arena to realize a novel magnetoelectric function. Here we demonstrate the genuine electric control of the spiral magnetic structure in one of such magnetic ferroelectrics, TbMnO3. A spinpolarized neutron scattering experiment clearly shows that the spin helicity, clockwise or counterclockwise, is controlled by the direction of spontaneous polarization and hence by the polarity of the small cooling electric field.Electric control of magnetic spins or their ordering structure has long been a big challenge in condensed matter physics. Furthermore, manipulating the magnetization by electric field may provide a low energy-consuming way in spin-electronics and a higher data density in information storages [1,2]. There are a number of magnetoelectric materials whose magnetization can be changed, though minutely, with an external electric field, yet only a very few are known whose magnetic structure itself can be controlled by an electric field [1,3,4,5]. The use of ferroelectricity is perhaps indispensable to enhance the electric field action on the magnetic spins. [2] One of the robust mechanisms to produce the ferroelectricicty of magnetic origin has been recently proposed by Katsura, Nagaosa, and Balatsky (KNB) [6]. The overlap of the electronic wave function between the two atomic sites (i and i + 1) with mutually canted spins (S i and S i+1 ) can generate electric polarization,, where e i,i+1 denotes the unit vector connecting the two sites and A is a constant determined by the spin exchange interaction and the spin-orbit interaction. (Note that the similar theoretical results have been obtained independently also in refs. [7,8]). In case the transverse-spiral (cycloidal) spin order is realized ( Fig. 1(b)), the uniform spontaneous polarization is expected to emerge as the sum of the local polarization p i in the direction perpendicular to the spiral propagation vector and the vector chirality,). This spin-driven ferroelectricity has recently been found in several transversespiral magnets such as TbMnO 3 (ref.[9]), Ni 3 V 2 O 8 (ref.[10]), MnWO 4 (ref.[11]), and also in a transverse conespiral magnet CoCr 2 O 4 (ref.[12]). We report here the quantitative elucidation of such magnetically induced ferroelectricity in terms of the spin ellipticity as the order parameter and show the successful electric control between the clockwise (CW) and counter-clockwise (CCW) spin helixes.A family of perovskite manganites, RMnO 3 with R being Tb, Dy, and their solid solution, have recently been demonstrated to undergo a ferroelectric transition at the Curie temperature T C of 20 − 30 K (see the example shown in Fig. 1(c)) [13,14]. Below T N ∼ 40 K, the compounds undergo a long-range spin ordering with the modulation vector Q s = (0, ±q, 1) with q = 1/2 − 1/4 (in P bnm orthorhombic setting) [9,15]. This has been ascribed to the spin frustration effect caused by the combination of GdFeO 3 -type distortion and staggered orbital or...

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Electric Control of Spin Helicity in a Magnetic Ferroelectric

et al. 2007

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“…All magnetic moments are perpendicular to the propagation vector τ that points along the 111 crystallographic directions. 2,3 In the helical phase, small-angle neutron scattering shows well-defined Bragg peaks of the same intensity at all equivalent magnetic reflections | τ 111 |, with τ = | τ 111 | = 0.036Å −1 .…”

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Magnetic fluctuations and correlations in MnSi: Evidence for a chiral skyrmion spin liquid phase

et al. 2011

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We present a comprehensive analysis of high-resolution neutron scattering data involving neutron spin echo spectroscopy and spherical polarimetry, which confirm the first-order nature of the helical transition in MnSi. The experiments reveal the existence of a totally chiral dynamic phase in a very narrow temperature range above T C . This unconventional magnetic short-range order has a topology similar to that of a skyrmion liquid or the blue phases of liquid crystals.

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“…[2] It was established by Ishikawa et al [3] that the order is that of a long-wavelength heliomagnet [4] (wavelength 2π/q ≈ 190Å, q ≈ 1 20 π a ) with an ordered moment of 0.4 µ B /Mn. The spiral structure has been attributed to the lack of inversion symmetry in its B20 crystal structure, which brings the Dzyaloshinski-Moriya interaction into play.…”

Section: Introductionmentioning

confidence: 99%

Implications of the B20 crystal structure for the magnetoelectronic structure ofMnSi

Jeong

Pickett

2004

Phys. Rev. B

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Due to increased interest in the unusual magnetic and transport behavior of MnSi and its possible relation to its crystal structure (B20) which has unusual coordination and lacks inversion symmetry, we provide a detailed analysis of the electronic and magnetic structure of MnSi. The non-symmorphic P213 spacegroup leads to unusual fourfold degenerate states at the zone corner R point, as well as "sticking" of pairs of bands throughout the entire Brillouin zone surface. The resulting Fermi surface acquires unusual features as a result of the band sticking. For the ferromagnetic system (neglecting the long wavelength spin spiral) with the observed moment of 0.4 µB/Mn, one of the fourfold levels at R in the minority bands falls at the Fermi energy (EF ), and a threefold majority level at k=0 also falls at EF . The band sticking and presence of bands with vanishing velocity at EF imply an unusually large phase space for long wavelength, low energy interband transitions that will be important for understanding the unusual resistivity and far infrared optical behavior.

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Spiral magnetic correlation in cubic MnSi

Cited by 127 publications

References 14 publications

Electric Control of Spin Helicity in a Magnetic Ferroelectric

Electric Control of Spin Helicity in a Magnetic Ferroelectric

Magnetic fluctuations and correlations in MnSi: Evidence for a chiral skyrmion spin liquid phase

Implications of the B20 crystal structure for the magnetoelectronic structure ofMnSi

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