Academic literature on the topic 'Helimagnetism'
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Journal articles on the topic "Helimagnetism"
Zhang, S. L., R. Chalasani, A. A. Baker, N. J. Steinke, A. I. Figueroa, A. Kohn, G. van der Laan, and T. Hesjedal. "Engineering helimagnetism in MnSi thin films." AIP Advances 6, no. 1 (January 2016): 015217. http://dx.doi.org/10.1063/1.4941316.
Full textBallou, R., J. Deportes, R. Lemaire, Y. Nakamura, and B. Ouladdiaf. "Helimagnetism in the cubic Laves phase YMn2." Journal of Magnetism and Magnetic Materials 70, no. 1-3 (December 1987): 129–33. http://dx.doi.org/10.1016/0304-8853(87)90379-9.
Full textTheis-Bröhl, Katharina, K. A. Ritley, C. P. Flynn, K. Hamacher, H. Kaiser, and J. J. Rhyne. "Coexisting ferro- and helimagnetism in Dy/Y superlattices." Journal of Applied Physics 81, no. 8 (April 15, 1997): 5375–77. http://dx.doi.org/10.1063/1.364603.
Full textKousaka, Y., Y. Nakao, J. Kishine, M. Akita, K. Inoue, and J. Akimitsu. "Chiral helimagnetism in T1/3NbS2 (T=Cr and Mn)." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 600, no. 1 (February 2009): 250–53. http://dx.doi.org/10.1016/j.nima.2008.11.040.
Full textDrechsler, S. L., J. Richter, R. Kuzian, J. Málek, N. Tristan, B. Büchner, A. S. Moskvin, et al. "Helimagnetism and weak ferromagnetism in edge-shared chain cuprates." Journal of Magnetism and Magnetic Materials 316, no. 2 (September 2007): 306–12. http://dx.doi.org/10.1016/j.jmmm.2007.03.200.
Full textGoldman, M., J. F. Jacquinot, and C. Urbina. "Rotating transverse nuclear helimagnetism in CaF2. II. Theoretical approximations." Journal of Physics C: Solid State Physics 19, no. 13 (May 10, 1986): 2299–328. http://dx.doi.org/10.1088/0022-3719/19/13/017.
Full textEnderle, M., C. Mukherjee, B. Fåk, R. K. Kremer, J. M. Broto, H. Rosner, S. L. Drechsler, et al. "Quantum helimagnetism of the frustrated spin-½ chain LiCuVO 4." Europhysics Letters (EPL) 70, no. 2 (April 2005): 237–43. http://dx.doi.org/10.1209/epl/i2004-10484-x.
Full textSilva, M. Salgueiro da, J. M. Moreira, M. M. Pereira de Azevedo, J. A. Mendes, C. S. de Abreu, J. B. Sousa, R. J. Melville, and S. B. Palmer. "Helimagnetism and field-induced phases in random Gd64Sc36single crystals." Journal of Physics: Condensed Matter 11, no. 37 (September 2, 1999): 7115–24. http://dx.doi.org/10.1088/0953-8984/11/37/309.
Full textMelville, R. J., S. B. Palmer, S. Bates, and G. J. McIntyre. "Random field effects and breakup of helimagnetism in Gd60Y60." Journal of Magnetism and Magnetic Materials 116, no. 1-2 (October 1992): 267–72. http://dx.doi.org/10.1016/0304-8853(92)90171-j.
Full textDevyaterikov, D. I., E. A. Kravtsov, V. V. Proglyado, V. D. Zhaketov, and Yu V. Nikitenko. "Study of Helimagnetism in Dy/Ho Superlattice by Neutron Reflectometry." Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques 16, no. 5 (October 2022): 839–42. http://dx.doi.org/10.1134/s1027451022050299.
Full textDissertations / Theses on the topic "Helimagnetism"
Rocco, Luisa. "Crystal growth and physical properties of helimagnetic oxides." Doctoral thesis, Universita degli studi di Salerno, 2017. http://hdl.handle.net/10556/2572.
Full textThis work is focused on two helimagnetic materials: Ba2CuGe2O7 and Cu3Nb2O8. Recent studies report a number of interesting anisotropic proper- ties [1, 2, 3]. Ba2CuGe2O7 melilite oxide shows a complex magnetic behaviour, indeed it is known that at low temperature the system undergoes a transition from a paramagnetic phase to an incommensurate antiferromagnetic cycloid spin structure. Applying a magnetic field, additional magnetic transitions take place, as for example a spin-cone phase [3]. Moreover, Ba2CuGe2O7 shows also multiferroic properties [1]. Several works report that the physical properties of melilite oxides mainly depend on the nature of the transition metal ion, thus interesting proper- ties could emerge in mixed melilite oxides. In this work Ba2MGe2O7 with M=Cu,Ni and Mn have been studied. Cu3Nb2O8 is an unusual helimagnetic compound that undergoes a series of magnetic ordering at low temperature. Development of electric polarization P has been reported at TN=25K corresponding to emergence of a non-collinear helicoidal ordering. P is oriented perpendicularly to the common plane of rotation of the spins. This observation cannot be reconciled with the conven- tional theory developed for cycloidal multiferroics [2]. The study of all these complex anisotropic phenomena requires the availability of good single crystals. In this thesis, an investigation on crystal growth conditions of Ba2MGe2O7 and of Cu3Nb2O8 will be presented [4, 5]. Single crystal samples are vital to study the physical properties exhibited by compounds which have high magnetic/ferroelectric anisotropy where significantly different behaviour is seen along different crystallographic directions. Preliminarily, high quality polycrystalline powders have been prepared for all compounds, indeed this is a critical point to grow pure crystalline samples. 1 Abstract 2 In this work the procedure to synthesize polycrystalline powders with high purity is reported. Moreover, by using powder X-ray diffraction and energy dispersive spectroscopy (EDS), the composition of the starting polycrystalline powder is checked. Successfully, the growth conditions to realize large and pure single crystals suitable for low temperature magnetometry and lattice dynamic studies are described. The chemical composition and the morphology of the crystals are investigated by X-ray diffraction and by scanning electron microscopy (SEM), with wave- length dispersive spectrometry (WDS). Furthermore, the excellent quality of the crystals is confirmed by rocking curve measurements. The X-ray Laue back reflection and electron backscattered diffraction (EBSD) techniques are used to orient single crystals specifically for selected experi- ments. To study the magnetic phase diagrams of grown crystals, magnetization measurement vs temperature is performed in the range 1.5 K
Beg, Marijan. "Skyrmionic states in confined helimagnetic nanostructures." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/402969/.
Full textGregory, Christopher Ian. "Magnetic properties of the itinerant helimagnets MnSi and FeGe." Thesis, Durham University, 1992. http://etheses.dur.ac.uk/6057/.
Full textKöhler, Laura [Verfasser], Markus [Gutachter] Garst, and Matthias [Gutachter] Vojta. "Exciting helimagnets / Laura Köhler ; Gutachter: Markus Garst, Matthias Vojta." Dresden : Technische Universität Dresden, 2021. http://d-nb.info/123184714X/34.
Full textJonietz, Florian [Verfasser], PETER [Akademischer Betreuer] BOENI, and Rudolf [Akademischer Betreuer] Gross. "Spin Transfer Torques and Spin Fluctuations in Helimagnets / Florian Jonietz. Gutachter: Rudolf Gross. Betreuer: Peter Böni." München : Universitätsbibliothek der TU München, 2012. http://d-nb.info/1021219177/34.
Full textLeonov, Andriy. "Twisted, localized, and modulated states described in the phenomenological theory of chiral and nanoscale ferromagnets." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-83823.
Full textBauer, Andreas [Verfasser], Christian [Akademischer Betreuer] Pfleiderer, Rudolf [Akademischer Betreuer] Gross, and Wolf [Akademischer Betreuer] Assmus. "Investigation of itinerant antiferromagnets and cubic chiral helimagnets / Andreas Bauer. Betreuer: Christian Pfleiderer. Gutachter: Rudolf Gross ; Christian Pfleiderer ; Wolf Assmus." München : Universitätsbibliothek der TU München, 2014. http://d-nb.info/1080720995/34.
Full textBauer, Andreas Verfasser], Christian [Akademischer Betreuer] Pfleiderer, Rudolf [Akademischer Betreuer] [Gross, and Wolf [Akademischer Betreuer] Assmus. "Investigation of itinerant antiferromagnets and cubic chiral helimagnets / Andreas Bauer. Betreuer: Christian Pfleiderer. Gutachter: Rudolf Gross ; Christian Pfleiderer ; Wolf Assmus." München : Universitätsbibliothek der TU München, 2014. http://nbn-resolving.de/urn:nbn:de:bvb:91-diss-20141219-1229637-0-8.
Full textSchwarze, Thomas [Verfasser], Dirk [Akademischer Betreuer] Grundler, and Christian [Akademischer Betreuer] Pfleiderer. "Spin Waves in 2D and 3D Magnonic Crystals: From Nanostructured Ferromagnetic Materials to Chiral Helimagnets / Thomas Schwarze. Gutachter: Dirk Grundler ; Christian Pfleiderer. Betreuer: Dirk Grundler." München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/1046176013/34.
Full textEl, hog Sahbi. "Transition de phase dans les films magnétiques minces avec interactions concurrentes." Thesis, Cergy-Pontoise, 2017. http://www.theses.fr/2017CERG0843/document.
Full textIn this thesis, we study the phase transition and thermodynamic properties of classical and quantum spin models in thin films using both Green's function and standard Monte Carlo simulation.In chapter 1, we study the Blume-Emery-Griffith model. This model has been introduced to describe the mixing phase of superfluid He$^4$ ($S_i=pm$ 1) and normal fluid He$^3$ ($S_i$= 0) at low temperatures, such system undergoes two kinds of phase transition, first and second-order ones. Using Monte Carlo simulation, we show that there exists a critical value of anisotopy D$below (above) which the transition is of second (first) order, and that the first order nature of transition does not disappear when we reduce the film thickness unlike in other systems where the bulk first-order transition becomes second order with small thickness. In the Helium vocabulary, we show that the film surfaces have a deficit of He$^4$ with respect to interior layers of the film.In chapter 2 we first study quantum properties of a helimagnetic thin film. We show that there exist surface acoustic and optical modes which affect the surface magnetization. We also show that quantum fluctuations cause the spin contraction at $T$=0 and give rise to a cross-over between layer magnetizations at low temperatures. In the second part of chapter 2, we are interested in the effect of an external magnetic field applied. We show that spins react to a moderate applied magnetic field by creating a particular spin configuration along the $c$-axis. Using Monte Carlo simulation we study the phase transition as functions of the magnetic field strength. We show that the system undergoes a phase transition triggered by the destruction of the transverse xy spin-components. At low temperatures, we investigate effects of quantum fluctuations using Green's function method. The results show that the zero-point spin contraction is different from layer to layer. We also find a crossover of layer magnetizations which depends on the magnitude of helical angles.In the third chapter, we introduce the in-plane Dzyaloshinskii-Moriya interaction (DM). It has been showed in various works that the DM interaction is at the origin of topological skyrmions and a new kind of magnetic domain walls. In this chapter, we are interested in the spin-wave properties of a system of spins interacting with each other via a DM interaction. Using the steepest descend method we found a non-collinear ground state which is due to the competition between the ferromagnetic and the asymmetric DM interaction. We use the Green's function theory to calculate the spin-wave spectrum and the layer magnetization at finite temperatures in two and three dimensions as well as in a thin film with surface effects. We found that the spin-wave excitation in 2D and 3D crystals is stable at $T$=0 without the need of an anisotropy, but in the case of a thin film we need a small anisotropy to stabilize the spin-wave spectrum because of the lack of neighbors at the surface. We find also that the spin-wave energy is proportional to $k^2$ for a small DM interaction and is linear in $k$ for a strong one.Finally, in the fourth chapter we are interested in skyrmion crystals created by the competition between the ferromagnetic interaction and the DM interaction under an applied magnetic field. They arrange themselves in a periodic structure. These skyrmion crystals have been experimentally observed in MnSi compounds and in doped semiconductors. Using Monte Carlo simulation, we show that skyrmion crystals are stable at finite temperatures up to a transition temperature where the topological structure of each skyrmion and the periodic structure of skyrmions are destroyed. We also investigate the relaxation of the skyrmions in the crystalline phase and find that the relaxation time follows a stretched exponential law which is a characteristic of slowly-relaxed systems such as spin glasses
Books on the topic "Helimagnetism"
Nagaosa, N. Multiferroics. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198787075.003.0010.
Full textBook chapters on the topic "Helimagnetism"
Shiomi, Yuki. "Topological Hall Effect in Itinerant Helimagnets." In Springer Theses, 65–85. Tokyo: Springer Japan, 2013. http://dx.doi.org/10.1007/978-4-431-54361-9_5.
Full textSeki, Shinichiro. "Magnetoelectric Response in $$S=1/2$$ Chain Helimagnets." In Magnetoelectric Response in Low-Dimensional Frustrated Spin Systems, 85–104. Tokyo: Springer Japan, 2012. http://dx.doi.org/10.1007/978-4-431-54091-5_4.
Full textDiep, Hung T. "Phase Transition in Helimagnetic Thin Films." In Physics of Magnetic Thin Films, 275–308. Jenny Stanford Publishing, 2021. http://dx.doi.org/10.1201/9781003121107-13.
Full textDiep, Hung T. "Partial Phase Transition in Helimagnetic Thin Films in a Field." In Physics of Magnetic Thin Films, 309–31. Jenny Stanford Publishing, 2021. http://dx.doi.org/10.1201/9781003121107-14.
Full textLeonov, Andrey O., and Catherine Pappas. "Multiple skyrmionic states and oblique spirals in bulk cubic helimagnets." In Magnetic Skyrmions and Their Applications, 347–66. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-820815-1.00008-0.
Full textConference papers on the topic "Helimagnetism"
Sander, Dirk. "Helimagnetism in nanometer small bilayer iron islands (Presentation Recording)." In SPIE Nanoscience + Engineering, edited by Henri-Jean Drouhin, Jean-Eric Wegrowe, and Manijeh Razeghi. SPIE, 2015. http://dx.doi.org/10.1117/12.2191607.
Full textMaruyama, Kenichi, Seiya Tanaka, Ryoji Kiyanagi, Akiko Nakao, Kentaro Moriyama, Yoshihisa Ishikawa, and Shigenori Utsumi. "Helimagnetism of Ba(Fe1−xScx)12O19 Studied by Magnetization Measurement and Neutron Diffraction." In Proceedings of the 3rd J-PARC Symposium (J-PARC2019). Journal of the Physical Society of Japan, 2021. http://dx.doi.org/10.7566/jpscp.33.011061.
Full textZang, J. "Individual skyrmions in helimagnets." In 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7157620.
Full textLin, J. G., and T. C. Han. "Magnetic and structural transitions in helimagnetic YMn/sub 2/O/sub 5/." In INTERMAG Asia 2005: Digest of the IEEE International Magnetics Conference. IEEE, 2005. http://dx.doi.org/10.1109/intmag.2005.1464495.
Full textSchneider, Sebastian. "Towards the 3D quantification of the Skyrmion spin texture in thin helimagnets." In European Microscopy Congress 2020. Royal Microscopical Society, 2021. http://dx.doi.org/10.22443/rms.emc2020.236.
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