Domain stability and polar-vortex transformations controlled by mechanical loads in soft ferromagnetic nanodots

Sheng, Qiang; Liu, X. L.; Chen, W. J.; Xiong, Weiming; Jiang, Gelei; Zheng, Yue

doi:10.1063/1.4943507

Cited by 7 publications

(4 citation statements)

References 29 publications

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“…It shows that competition between stress-induced anisotropy and the shape anisotropy gives rise to multi-vortex domain states, whilst an alignment of the aniso tropies stabilizes a singledomain state. Phase-field simulations also showed that strains can effectively influence the phase boundaries between single-domain, singe-vortex, and multiple-vortex states, leading to strain-induced vortex phase transition [308,343].…”

Section: Effects Of Other Factors On Vortex Formationmentioning

confidence: 99%

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Characteristics and controllability of vortices in ferromagnetics, ferroelectrics, and multiferroics

Zheng

Chen

2017

Rep. Prog. Phys.

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Topological defects in condensed matter are attracting e significant attention due to their important role in phase transition and their fascinating characteristics. Among the various types of matter, ferroics which possess a switchable physical characteristic and form domain structure are ideal systems to form topological defects. In particular, a special class of topological defects-vortices-have been found to commonly exist in ferroics. They often manifest themselves as singular regions where domains merge in large systems, or stabilize as novel order states instead of forming domain structures in small enough systems. Understanding the characteristics and controllability of vortices in ferroics can provide us with deeper insight into the phase transition of condensed matter and also exciting opportunities in designing novel functional devices such as nano-memories, sensors, and transducers based on topological defects. In this review, we summarize the recent experimental and theoretical progress in ferroic vortices, with emphasis on those spin/dipole vortices formed in nanoscale ferromagnetics and ferroelectrics, and those structural domain vortices formed in multiferroic hexagonal manganites. We begin with an overview of this field. The fundamental concepts of ferroic vortices, followed by the theoretical simulation and experimental methods to explore ferroic vortices, are then introduced. The various characteristics of vortices (e.g. formation mechanisms, static/dynamic features, and electronic properties) and their controllability (e.g. by size, geometry, external thermal, electrical, magnetic, or mechanical fields) in ferromagnetics, ferroelectrics, and multiferroics are discussed in detail in individual sections. Finally, we conclude this review with an outlook on this rapidly developing field.

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Section: Effects Of Other Factors On Vortex Formationmentioning

confidence: 99%

“…Copyright (2009) American Physical Society. [308,342,343] on the stability of magnetic vortex state, in contrast with its ferroelectric counterparts. Using a firstorder reversal curve technique, Dumas et al [339] studied the temper ature dependence of magnetization reversal in sub-100 nm Fe nanodots.…”

Section: Effects Of Other Factors On Vortex Formationmentioning

confidence: 99%

Characteristics and controllability of vortices in ferromagnetics, ferroelectrics, and multiferroics

Zheng

Chen

2017

Rep. Prog. Phys.

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“…It was shown that micromagnetic simulations could predict the magnetic properties for FePt based exchange-coupled bit patterned media [ 22 , 23 , 24 , 25 , 26 , 27 ]; however, only a few works for core-shell shaped island composite were reported. It should be noted that the hysteresis loop of the core-shell island is very sensitive to the stacking structure of the composite.…”

Section: Introductionmentioning

confidence: 99%

Switching Diagram of Core-Shell FePt/Fe Nanocomposites for Bit Patterned Media

et al. 2022

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In the current work, a core-shell type exchange coupled composite structure was constructed by micromagnetic simulation with a phase FePt core and an iron shell. Four types of switching loops with magnetic domain structure evolution were demonstrated. Based on the simulation results, a switching type diagram was constructed, which displays various hysteresis loops as a function of core radius and shell thickness. Furthermore, the effects of switching type and composite structure on the coercivity and remanent magnetization were predicted and discussed. This finding indicates that core-shell type FePt/Fe composite structure film has a large advantage in designing exchange-coupled bit patterned media to realize high-density storage devices at the nanoscale.

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“…15 Recently, via phase-field simulations we also demonstrated that stress can effectively influence the relative stability between polar and vortex states in FeGa nanodots, leading to stress-induced transformations between polar and vortex states. 16 Despite of these efforts, a comprehensive view of magnetic state stability and transformations in submicron magnetic systems under the combining effects of size, shape and strain is still lacking.…”

Section: Introductionmentioning

confidence: 99%

Phase diagrams of magnetic state transformations in multiferroic composites controlled by size, shape and interfacial coupling strain

et al. 2017

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This work aims to give a comprehensive view of magnetic state stability and transformations in PZT-film/FeGa-dot multiferroic composite systems due to the combining effects of size, shape and interfacial coupling strain. It is found that the stable magnetic state of the FeGa nanodots is not only a function of the size and shape of the nanodot but also strongly sensitive to the interfacial coupling strain modified by the polarization state of PZT film. In particular, due to the large magnetostriction of FeGa, the phase boundaries between different magnetic states (i.e., in-plane/out-of-plane polar states, and single-/multi-vortex states) of FeGa nanodots can be effectively tuned by the polarization-mediated strain. Fruitful strain-mediated transformation paths of magnetic states including those between states with different orderings (i.e., one is polar and the other is vortex), as well as those between states with the same ordering (i.e., both are polar or both are vortex) have been revealed in a comprehensive view. Our result sheds light on the potential of utilizing electric field to induce fruitful magnetic state transformation paths in multiferroic film-dot systems towards a development of novel magnetic random access memories.

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Domain stability and polar-vortex transformations controlled by mechanical loads in soft ferromagnetic nanodots

Cited by 7 publications

References 29 publications

Characteristics and controllability of vortices in ferromagnetics, ferroelectrics, and multiferroics

Characteristics and controllability of vortices in ferromagnetics, ferroelectrics, and multiferroics

Switching Diagram of Core-Shell FePt/Fe Nanocomposites for Bit Patterned Media

Phase diagrams of magnetic state transformations in multiferroic composites controlled by size, shape and interfacial coupling strain

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