Micromagnetic modelling and magnetization processes

Fidler, J.; Schrefl, T.; Scholz, W.; Suess, Dieter; Dittrich, R.; Kirschner, M.

doi:10.1016/j.jmmm.2003.12.1007

Cited by 23 publications

(19 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The easy magnetization direction of SmCo 5 is aligned along the c-direction of the lattice, and the magnetocrystalline anisotropy constant ranges from 1.1-2.0 × 10 8 erg cm -3 (1 erg cm -3 = 0.1 J m -3 ); these values are among the highest known for hard magnetic materials. [7][8][9][10] Furthermore, this alloy exhibits a very high Curie temperature (T c = 1020 K), which makes it superior to other classes of permanent magnetic materials, such as FePt (T c = 750 K) and Nd 2 Fe 14 B (T c = 585 K), for high-temperature applications. [11][12][13][14] However, as with other rare-earth metal materials, metallic SmCo 5 nanoparticles are prone to fast oxidation.…”

mentioning

confidence: 99%

A Facile Synthesis of SmCo₅ Magnets from Core/Shell Co/Sm₂O₃ Nanoparticles

et al. 2007

View full text Add to dashboard Cite

SmCo5 magnets are synthesized by the facile Ca reduction of core/shell‐structured Co/Sm2O3 nanoparticles, as schematically illustrated in the figure. The magnets exhibit coercivities reaching 24 kOe at 100 K and 8 kOe at room temperature. The synthesis represents an important first step towards the fabrication of SmCo‐based exchange‐spring nanocomposites for high‐performance permanent magnet applications.

show abstract

mentioning

confidence: 99%

A Facile Synthesis of SmCo₅ Magnets from Core/Shell Co/Sm₂O₃ Nanoparticles

et al. 2007

View full text Add to dashboard Cite

show abstract

“…In the three-dimensional (3-D) polycrystalline model, the pinning mechanism is so complicated that the enhanced coercivity is discussed using a one-dimensional (1-D) planer model. 15,16 Scholz et al investigated the potential barrier thickness dependence of the pinning field (H pin ) using 1-D micromagnetic simulations. 17 They demonstrated that H pin increases with increasing barrier thickness and saturates at around the domain wall width.…”

Section: Calculation Results and Discussionmentioning

confidence: 99%

Large-scale micromagnetic simulation of Nd-Fe-B sintered magnets with Dy-rich shell structures

et al. 2016

View full text Add to dashboard Cite

Large-scale micromagnetic simulations have been performed using the energy minimization method on a model with structural features similar to those of Dy grain boundary diffusion (GBD)-processed sintered magnets. Coercivity increases as a linear function of the anisotropy field of the Dy-rich shell, which is independent of Dy composition in the core as long as the shell thickness is greater than about 15 nm. This result shows that the Dy contained in the initial sintered magnets prior to the GBD process is not essential for enhancing coercivity. Magnetization reversal patterns indicate that coercivity is strongly influenced by domain wall pinning at the grain boundary. This observation is found to be consistent with the one-dimensional pinning theory.

show abstract

“…the anisotropy field H K (16)(17)(18). In particular, intergranular exchange couplig becomes extremely important in nanocrystalline (spring) magnets, for which the exchange length (basically the length of a domain wall, which for these magnets is a few nanometers) is of the order of the grain size; this yields a more homogeneous magnetization distribution and, consequently, enhances their remanence, but, as a countereffect, it decreases their coercivity (19).…”

Section: Resultsmentioning

confidence: 99%

“…However, different simulation jobs have evidenced that the wall-like structure appearing at it acts as a "nucleation" site for the magnetization reversal, yielding coercivity values in the correct order of magnitude if the boundary exchange is a few tens percent of the bulk value (16)(17)(18). As en example, Figure 9 presents the switching field H S required to reverse the magnetization of a grain with a neighbouring grain with (initially) antiparallel magnetization, for an intergranular coupling of 80% the bulk value and for different values of the exchange-to-anisotropy ratio.…”

Section: Resultsmentioning

confidence: 99%