Nanolithographically defined magnetic structures and quantum magnetic disk (invited)

Chou, Stephen Y.; Krauss, Peter R.; Kong, Linshu

doi:10.1063/1.362440

Cited by 272 publications

(134 citation statements)

References 17 publications

Supporting

Mentioning

130

Contrasting

Order By: Relevance

“…1,2 Among the various approaches, [3][4][5][6][7][8] the one with a buried stressor appears to be very promising for being the one that does not require fine lithographic techniques that are usually associated with throughput limitations. It has been well known that Ge SAQDs grown on a relaxed SiGe buffer layer preferentially nucleate along buried dislocations.…”

Section: Introductionmentioning

confidence: 99%

Three-stage nucleation and growth of Ge self-assembled quantum dots grown on partially relaxed SiGe buffer layers

2003

View full text Add to dashboard Cite

Three-stage nucleation and growth of Ge self-assembled quantum dots ͑SAQDs͒ on a relaxed SiGe buffer layer has been studied. Plastic relaxation of the SiGe buffer layer is associated with a network of buried 60°d islocations leading to an undulating strain field. As a result, the surface possesses three different types of sites for the nucleation and growth of Ge SAQDs: over the intersection of two perpendicular buried dislocations, over a single dislocation line, and in the region beyond one diffusion length away from any dislocation. Ge SAQDs are observed to nucleate exclusively over the dislocation intersections first, followed by over single dislocation lines, and finally in the region far away from dislocations. By increasing the Ge coverage at a slow rate, the prenucleation stage at the various sites is observed. It appears that the varying strain field has a significant effect on both the diffusion of Ge adatoms before SAQD nucleation, as well as the shape evolution of the SAQDs after they form. Moreover, two distinctly different self-assembly mechanisms are observed at different sites. There exist denuded zones free of Ge SAQDs adjacent to dislocation lines. The width of the denuded zone can be used to make direct determination of the Ge adatom diffusion lengths. The partially relaxed substrate provides a useful experimental vehicle for the in-depth understanding of the formation mechanism of SAQDs grown epitaxially in the Stranski-Krastanov growth mode.

show abstract

Section: Introductionmentioning

confidence: 99%

Three-stage nucleation and growth of Ge self-assembled quantum dots grown on partially relaxed SiGe buffer layers

2003

View full text Add to dashboard Cite

show abstract

“…For example, as the size of the individual magnetic nanoparticle reduces, it approaches the superparamagnetic limit at room temperature [13,14]. In the superparamagnetic state, an inter-particle ordered state is not established within the time frame of static magnetic measurements, t = 100 s [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of magnetic Ni nanoparticles into 1D arrays with antiferromagnetic order

Bliznyuk¹,

Singamaneni²,

Sahoo³

et al. 2009

Nanotechnology

View full text Add to dashboard Cite

In this paper, we report on the magnetic properties of isolated nanoparticles and interacting nanochains formed by the self-assembly of Ni nanoparticles. The magnetic properties were studied using superconducting quantum interference device (SQUID) magnetometry and magnetic force microscopy (MFM). We demonstrate that single-domain Ni nanoparticles spontaneously form one-dimensional (1D) chains under the influence of an external magnetic field. Furthermore, such magnetic field-driven self-assembly in conjunction with surface templating produces regular arrays of 1D nanochains with antiferromagnetic intra-chain order. The antiferromagnetic order, which is in striking contrast to what is found for non-interacting nanoparticle assemblies within the chains, can be evidenced from MFM and SQUID measurements.

show abstract

“…3,4 A matter of particular interest is the accurate control of the switching between magnetic states. Each structure should exhibit an easily accessible plane magnetic anisotropy, i.e., in addition to the remanent state, a second well-defined state is required to enable the implementation of binary bits.…”

Section: Introductionmentioning

confidence: 99%

Frustrated magnetic vortices in a triad of permalloy rings: Magneto-optical Kerr effect, magnetic force microscopy, and micromagnetic simulations

Rose

Buchanan

et al. 2006

Phys. Rev. B

View full text Add to dashboard Cite

The field dependent magnetization of three mutually touching permalloy rings were investigated by means of the magneto-optical Kerr effect, magnetic force microscopy, and micromagnetic simulations. Each ring has a width of 0.2-1.8 m, an outer diameter of 4 m, and a thickness of 17 nm. Decreasing an applied magnetic field from saturation leads to the nucleation and annihilation of magnetic vortices, leaving at least one ring in a magnetically frustrated state. The properties of the magnetization reversal strongly depend on the ring width and on the direction of the applied field. Multiple complex reversal paths with vortexlike magnetization configurations are found.

show abstract

Nanolithographically defined magnetic structures and quantum magnetic disk (invited)

Cited by 272 publications

References 17 publications

Three-stage nucleation and growth of Ge self-assembled quantum dots grown on partially relaxed SiGe buffer layers

Three-stage nucleation and growth of Ge self-assembled quantum dots grown on partially relaxed SiGe buffer layers

Self-assembly of magnetic Ni nanoparticles into 1D arrays with antiferromagnetic order

Frustrated magnetic vortices in a triad of permalloy rings: Magneto-optical Kerr effect, magnetic force microscopy, and micromagnetic simulations

Contact Info

Product

Resources

About