Ordered magnetic dipoles: Controlling anisotropy in nanomodulated continuous ferromagnetic films

Maity, Tuhin; Li, Shunpu; Keeney, Lynette; Roy, Saibal

doi:10.1103/physrevb.86.024438

Cited by 7 publications

(6 citation statements)

References 24 publications

(25 reference statements)

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“…The coercivity of the ordered nanodots is measured for different dot sizes at 2 K and it decreases with the decrease of particle size (Figure 7f). The decrease in coercivity is due to dipolar interaction between well ordered magnetic particles32.…”

Section: Resultsmentioning

confidence: 99%

Size and space controlled hexagonal arrays of superparamagnetic iron oxide nanodots: magnetic studies and application

Ghoshal

Maity²,

Senthamaraikannan

et al. 2013

Sci Rep

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Highly dense hexagonally arranged iron oxide nanodots array were fabricated using PS-b-PEO self-assembled patterns. The copolymer molecular weight, composition and choice of annealing solvent/s allows dimensional and structural control of the nanopatterns at large scale. A mechanism is proposed to create scaffolds through degradation and/or modification of cylindrical domains. A methodology based on selective metal ion inclusion and subsequent processing was used to create iron oxide nanodots array. The nanodots have uniform size and shape and their placement mimics the original self-assembled nanopatterns. For the first time these precisely defined and size selective systems of ordered nanodots allow careful investigation of magnetic properties in dimensions from 50 nm to 10 nm, which delineate the nanodots are superparamagnetic, well-isolated and size monodispersed. This diameter/spacing controlled iron oxide nanodots systems were demonstrated as a resistant mask over silicon to fabricate densely packed, identical ordered, high aspect ratio silicon nanopillars and nanowire features.

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Section: Resultsmentioning

confidence: 99%

Size and space controlled hexagonal arrays of superparamagnetic iron oxide nanodots: magnetic studies and application

Ghoshal

Maity²,

Senthamaraikannan

et al. 2013

Sci Rep

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“…Hence, the pattern of a square array clearly shows fourfold symmetry of anisotropy which comes from dipolar interaction in threedimensional (3D) nanomodulation, delineating the dependence of anisotropy symmetry on the symmetry of modulation. [Maity 2012] …”

Section: Discussionmentioning

confidence: 99%

“…For a square array pattern of 400-nm diameter and 100-nm modulation the energy density of vortex 0.49×10 4 J/m 3 is lower than energy of single domain state 1.33×10 4 J/m 3 . [Li 2010, Maity 2012] Hence there will be a natural tendency to adopt vortex state in this modulated film to minimize the energy. Here the competition between two different dipoles (in-plane and out-of-plane) and possible spin pinning between two consecutive dipoles through continuous ferromagnetic media keeps the magnetization stable in the direction of applied field and resists vortex formation.…”

Section: Discussionmentioning

confidence: 99%

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Manipulation of Magnetic Properties by Tunable Magnetic Dipoles in a Ferromagnetic Thin Film

Maity

Roy

2017

IEEE Magn. Lett.

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“…For composition-graded films and layer structural composite films, the composition should be carefully controlled during the film growth process. While planar films have been extensively grown and studied, also noteworthy are those with surface modulation [133,134,[160][161][162]. Films with surface modulation can be obtained by using patterned substrates or templates, or using lithography techniques after the growth of uniform films.…”

Section: Materials and Structurementioning

confidence: 99%

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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Ordered magnetic dipoles: Controlling anisotropy in nanomodulated continuous ferromagnetic films

Cited by 7 publications

References 24 publications

Size and space controlled hexagonal arrays of superparamagnetic iron oxide nanodots: magnetic studies and application

Size and space controlled hexagonal arrays of superparamagnetic iron oxide nanodots: magnetic studies and application

Manipulation of Magnetic Properties by Tunable Magnetic Dipoles in a Ferromagnetic Thin Film

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

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