Wavevector and spin reorientation in MnSi

Plumer, M. L.; Walker, M. B.

doi:10.1088/0022-3719/14/31/016

Cited by 64 publications

(59 citation statements)

References 13 publications

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“…The pitch vector Q points along 111 and the magnetic moments lie perpendicular to it. 16 If an external magnetic field is applied in a direction other than 111 , Q will rotate in the direction of the magnetic field and become parallel to it at a field μ 0 H C1 ≃ 0.1 T, as shown theoretically by Plumer and Walker, 17 and confirmed more recently with small-angle neutron scattering (SANS). 18 Above H C1 , the magnetic moments form a conical phase, which collapses into a ferromagnetic state at μ 0 H C2 = 0.6 T. In cubic helimagnets, there is a narrow temperature interval between the paramagnetic phase and the region of regular chiral modulations where a number of complex multidimensional states and numerous physical anomalies have been observed.…”

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confidence: 64%

Chiral modulations and reorientation effects in MnSi thin films

et al. 2012

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We present an experimental and theoretical investigation of the influence of a uniaxial magnetocrystalline anisotropy on the magnetic textures that are formed in a chiral magnetic system. We show that the epitaxially induced tensile stress in MnSi thin films grown on Si (111) creates an easy-plane uniaxial anisotropy. The magnetoelastic shear stress coefficient is derived from SQUID magnetometry measurements in combination with transmission electron microscopy and x-ray diffraction data. Density functional calculations of the magnetoelastic coefficient support the conclusion that the uniaxial anisotropy originates from the magnetoelastic coupling. Theoretical calculations based on a Dzyaloshinskii model that includes an easy-plane anisotropy predict a variety of modulations to the magnetic order that are not observed in bulk MnSi crystals. Evidence for these states is found in the magnetic hysteresis and polarized neutron reflectometry measurements.

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Chiral modulations and reorientation effects in MnSi thin films

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“…37,38 It is characterized by a strongly anisotropic susceptibility, induced by the last term in Eq. (31).…”

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confidence: 99%

Theory of helical spin crystals: Phases, textures, and properties

2006

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Motivated by recent experiments on the itinerant helimagnet MnSi, we study general properties of helical spin crystals -magnetic structures obtained by superposing distinct spin spirals. An effective Landau description of helical spin crystals is introduced and simple rules for stabilizing various spin crystal structures over single spirals are established. Curious properties of the magnetic structures so obtained, such as symmetry stabilized topological textures and missing Bragg reflections are pointed out. The response of helical spin crystals to crystalline anisotropy, magnetic field and nonmagnetic disorder are studied, with special reference to the bcc1 spin structure, a promising starting point for discussing the 'partial order' phases seen at high pressure in MnSi. Similar approaches may be applied to other crystallization problems such as Larkin-Ovchinnikov-Fulde-Ferrel states in spin-imbalanced superconductors.

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“…Helimagnets are special cases of a large family of periodic non collinear spin structures called frustrated systems of XY and Heisenberg spins. The frustration has several origins: (i) it can be due to the geometry of the lattice such as the triangular lattice, the face-centered cubic (FCC) and hexagonalclose-packed (HCP) lattices, with antiferromagnetic NN interaction [11][12][13] (ii) it can be due to competing interactions between NN and NNN such as the case of helimagnets [1,2] shown in Fig. 1 (iii) it can be due to the * sahbi.el-hog@u-cergy.fr † diep@u-cergy.fr, corresponding author competition between the exchange interaction which favors collinear spin configurations and the DzyaloshinskiiMoriya (DM) interaction which favors perpendicular spin arrangements.…”

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Partial phase transition and quantum effects in helimagnetic films under an applied magnetic field

Hog

Diep

2017

Journal of Magnetism and Magnetic Materials

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We study the phase transition in a helimagnetic film with Heisenberg spins under an applied magnetic field in the c direction perpendicular to the film. The helical structure is due to the antiferromagnetic interaction between next-nearest neighbors in the c direction. Helimagnetic films in zero field are known to have a strong modification of the in-plane helical angle near the film surfaces. We show that spins react to a moderate applied magnetic field by creating a particular spin configuration along the c axis. With increasing temperature (T ), using Monte Carlo simulations we show that the system undergoes a phase transition triggered by the destruction of the ordering of a number of layers. This partial phase transition is shown to be intimately related to the ground-state spin structure. We show why some layers undergo a phase transition while others do not. The Green's function method for non collinear magnets is also carried out to investigate effects of quantum fluctuations. Non-uniform zero-point spin contractions and a crossover of layer magnetizations at low T are shown and discussed.

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Wavevector and spin reorientation in MnSi

Cited by 64 publications

References 13 publications

Chiral modulations and reorientation effects in MnSi thin films

Chiral modulations and reorientation effects in MnSi thin films

Theory of helical spin crystals: Phases, textures, and properties

Partial phase transition and quantum effects in helimagnetic films under an applied magnetic field

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