scholarly journals Flux-closure domains in high aspect ratio electroless-deposited CoNiB nanotubes

2018 ◽  
Vol 5 (4) ◽  
Author(s):  
Michal Staňo ◽  
Sandra Schaefer ◽  
Alexis Wartelle ◽  
Maxime Rioult ◽  
Rachid Belkhou ◽  
...  
Keyword(s):  
Grain Size ◽  
Wave Propagation ◽  
Aspect Ratio ◽  
Magnetic Anisotropy ◽  
Data Storage ◽  
Electroless Plating ◽  
High Aspect Ratio ◽  
Soft Magnetic Materials ◽  
Magnetic Domains ◽  
Soft Magnetic

We report the imaging of magnetic domains in ferromagnetic CoNiB nanotubes with very long aspect ratio, fabricated by electroless plating. While axial magnetization is expected for long tubes made of soft magnetic materials, we evidence series of azimuthal domains. We tentatively explain these by the interplay of anisotropic strain and/or grain size, with magneto-elasticity and/or anisotropic interfacial magnetic anisotropy. This material could be interesting for dense data storage, as well as curvature-induced magnetic phenomena such as the non-reciprocity of spin-wave propagation.

Magnetic domains and annealing-induced magnetic anisotropy in nanocrystalline soft magnetic materials

2008 ◽  
Vol 103 (7) ◽  
pp. 07E730 ◽  
Author(s):  
K. Suzuki ◽  
N. Ito ◽  
S. Saranu ◽  
U. Herr ◽  
A. Michels ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Materials ◽  
Soft Magnetic Materials ◽  
Magnetic Domains ◽  
Soft Magnetic ◽  
Induced Magnetic Anisotropy

Giant Magnetoimpedance in as Quenched Fe Based Nanocrystalline Ribbons

2005 ◽  
Vol 475-479 ◽  
pp. 2219-2222 ◽  
Author(s):  
Ji Fan Hu ◽  
Hong Wei Qin ◽  
Minhua Jiang ◽  
Bo Li ◽  
Dongliang Zhao ◽  
...  
Keyword(s):  
Grain Size ◽  
Magnetic Materials ◽  
Melt Spinning ◽  
Experimental Results ◽  
Soft Magnetic Materials ◽  
Soft Magnetic ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Additional Annealing ◽  
Melt Spinning Technique

FeCuNbSiB and FeZrBCu nanocrystalline ribbons can be obtained directly through the melt- spinning technique without additional annealing processes. The giant magnetoimpedance can be observed in FeCuNbSiB and FeZrBCu as quenched ribbons. The addition of Cu improves the nano-crystallization of a-Fe(Si) or a-Fe phase and reduces the grain size in FeCuNbSiB and FeZrBCu as quenched ribbons, which enhances the magnetoimpedance via increasing the variation of permeability under fields. The present experimental results reveal a novel route to fabricate the Fe based nanocrystalline soft magnetic materials with giant magnetoimpedance effect.

Coercivity Mechanism in Hard and Soft Sintered Magnetic Materials

2014 ◽  
Vol 802 ◽  
pp. 563-568 ◽  
Author(s):  
Marcos Flavio de Campos
Keyword(s):  
Grain Size ◽  
Domain Wall ◽  
Magnetic Materials ◽  
Wall Thickness ◽  
Magnetic Behavior ◽  
Soft Magnetic Materials ◽  
High Coercivity ◽  
Soft Magnetic ◽  
Hard Magnetic Materials ◽  
Wall Movement

The coercivity in soft and hard magnetic materials has different origin. The high coercivity of barium ferrite, SmCo5, Sm2Co17or Nd2Fe14B is due to high magnetocrystalline anisotropy, and the processing aims very small grain size (nanocrystalline). In the case of soft magnetic materials, the coercivity has origin in defects that are able to stop domain wall movement, as for example grain boundaries, inclusions or dislocations. Soft magnetic materials in general present large domain wall thickness (thousands of Angstroms for pure iron), whereas domain wall thickness is ~ 50 Angstroms for SmCo5and Nd2Fe14B. The differences between hard and soft magnetic behavior are commented and discussed. The domain wall energy and thickness can be used as parameters for classifying soft and hard magnetic behavior. Other examples of soft magnetic materials are the amorphous alloys and the nanocrystalline soft magnetic materials with grain size very below the single domain particle size. The soft behaviour in amorphous and soft nanocrystalline materials is also discussed.

scholarly journals Directional elastic wave propagation in high-aspect-ratio photoresist gratings: liquid infiltration and aging

Nanoscale ◽  
2017 ◽  
Vol 9 (8) ◽  
pp. 2739-2747 ◽  
Author(s):  
E. Alonso-Redondo ◽  
A. Gueddida ◽  
J. Li ◽  
B. Graczykowski ◽  
C. M. Sotomayor Torres ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Aspect Ratio ◽  
Elastic Wave ◽  
High Aspect Ratio ◽  
Elastic Wave Propagation ◽  
Liquid Infiltration

A General Coercivity Model for Soft Magnetic Materials

2012 ◽  
Vol 727-728 ◽  
pp. 157-162 ◽  
Author(s):  
Marcos Flavio de Campos
Keyword(s):  
Grain Size ◽  
Energy Balance ◽  
Magnetic Materials ◽  
Domain Walls ◽  
Soft Magnetic Materials ◽  
Force Balance ◽  
Balance Model ◽  
Soft Magnetic ◽  
Crystalline Defects ◽  
Magnetostatic Energy

The effect of crystalline imperfections (as for instance, grain size, inclusions and dislocations) on the coercivity of soft magnetic materials is additive. This only can be explained by an Energy Balance Model. By another hand, the angular dependence of the coercivity only can be explained with a Force Balance Model. Thus both models, Energy Balance and Force Balance have to be invoked for the construction of a general model. The effect of dislocations on the coercivity can be treated as short range magnetostrictive effect. The effect of inclusions needs the consideration of the global magnetostatic energy of the system. The dependence of the coercivity with the grain size can also be explained analyzing the magnetostatic energy. The idea of pinning of domain walls by crystalline defects is reformulated, and it is shown that the coercivity increase due to crystalline defects is principally caused by variations of the magnetostatic energy in the system.

Anisotropic electrical and magnetic properties in grain-oriented Bi4Ti3O12–La0.5Sr0.5MnO3

2018 ◽  
Vol 6 (42) ◽  
pp. 11272-11279 ◽  
Author(s):  
Wei Zou ◽  
Jianlin Wang ◽  
Zezhi Chen ◽  
Nai Shi ◽  
Zhiang Li ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Aspect Ratio ◽  
Magnetic Anisotropy ◽  
High Aspect Ratio ◽  
Spin Valves ◽  
Electrical And Magnetic Properties ◽  
Potential Applications

A high aspect ratio nanoplate and extremely high grain-oriented ceramics with large electrical and magnetic anisotropy in novel semiconducting Aurivillius ferroelectrics are obtained, which have potential applications in selective photocatalysis and charge-spin valves.

Sign in / Sign up

Export Citation Format

Share Document