Fully Epitaxial, Exchange Coupled SmCo$_{5}$/Fe Multilayers With Energy Densities above 400 kJ/m$^{3}$

Neu, V.; Sawatzki, Simon; Kopte, Martin; Mickel, C.; Schultz, L.

doi:10.1109/tmag.2012.2195646

Cited by 63 publications

(21 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There exist experimental proofs of principle with high magnetization and coercivity in thin films [25], [26], [33]- [36], but the challenge remains to maintain bulk coercivity in the presence of the soft phase. It is well-established that the soft phase of a two-phase system cannot be much larger than twice the Bloch-wall width of the hard phase, irrespective of dimensionality.…”

Section: Nanostructured Permanent Magnetsmentioning

confidence: 99%

Predicting the Future of Permanent-Magnet Materials

et al. 2013

View full text Add to dashboard Cite

There are two main thrusts towards new permanent-magnet materials: improving extrinsic properties by nanostructuring and intrinsic properties by atomic structuring. Theory-both numerical and analytical-plays an important role in this ambitious research. Our analysis of aligned hard-soft nanostructures shows that soft-in-hard geometries are better than hard-in-soft geometries and that embedded soft spheres are better than sandwiched soft layers. Concerning the choice of the hard phase, both a high magnetization and a high anisotropy are necessary. As an example of first-principle research, we consider interatomic Mn exchange in MnAl and find strongly ferromagnetic intralayer exchange, in spite of the small Mn-Mn distances.

show abstract

Section: Nanostructured Permanent Magnetsmentioning

confidence: 99%

Predicting the Future of Permanent-Magnet Materials

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Producing an anisotropic structure through grain alignment along easy magnetization axis is essential for high‐performance permanent magnetic materials, but it is extremely difficult in the bulk nanocomposites, as conventional methods including magnetic alignment and hot deformation of crystal materials become powerless for small nanograins . Although some progress has recently been made in generating anisotropic nanostructures with hard‐phase grain alignment in thin‐film model materials, the anisotropic nanostructures have hitherto been elusive in a bulk material.…”

mentioning

confidence: 99%

Novel Bimorphological Anisotropic Bulk Nanocomposite Materials with High Energy Products

et al. 2017

View full text Add to dashboard Cite

Nanostructuring of magnetically hard and soft materials is fascinating for exploring next-generation ultrastrong permanent magnets with less expensive rare-earth elements. However, the resulting hard/soft nanocomposites often exhibit random crystallographic orientations and monomorphological equiaxed grains, leading to inferior magnetic performances compared to corresponding pure rare-earth magnets. This study describes the first fabrication of a novel bimorphological anisotropic bulk nanocomposite using a multistep deformation approach, which consists of oriented hard-phase SmCo rod-shaped grains and soft-phase Fe(Co) equiaxed grains with a high fraction (≈28 wt%) and small size (≈10 nm). The nanocomposite exhibits a record-high energy product (28 MGOe) for this class of bulk materials with less rare-earth elements and outperforms, for the first time, the corresponding pure rare-earth magnet with 58% enhancement in energy product. These findings open up the door to moving from a pure permanent-magnet system to a stronger nanocomposite system at lower costs.

show abstract

“…[3][4][5][6][7][8][9][10][11][12] In particular, (BH) max values exceeding the theoretical limit of SmCo 5 have been reported in multi-layered and tri-layered SmCo 5 /a-Fe films, 11,12 which suggests that a layered structure has an advantage in controlling a microstructure.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties and microstructure of Sm-Co/α-Fe nanocomposite thick film-magnets composed of multi-layers over 700 layers

Tou¹,

Morimura²,

Nakano³

et al. 2014

Journal of Applied Physics

View full text Add to dashboard Cite

We synthesized Sm-Co/a-Fe nanocomposite film-magnets, approximately 10 lm in thickness, composed of 780 layers by the pulse laser deposition method. Transmission electron microscopic observations revealed that the synthesized film is composed of Sm-Co and a-Fe layers with the well-controlled a-Fe thickness of approximately 10-20 nm, which is suitable one predicted by the micromagnetic simulation. In spite of the enhanced interlayer diffusion of Fe and Co by annealing for crystallization, the (BH) max value of 100 kJ/m 3 was obtained at the averaged compositions of Sm/(Sm þ Co) ¼ 0.16 and Fe/(Sm þ Co þ Fe) ¼ 0.47. The a-Fe fraction for obtaining the highest (BH) max value was smaller than that expected from the micromagnetic simulation. Although the annealing for crystallization lay the easy direction of magnetization in the plane, the film is not expected to have strong crystallographic texture. V C 2014 AIP Publishing LLC. [http://dx

show abstract

Fully Epitaxial, Exchange Coupled SmCo$_{5}$/Fe Multilayers With Energy Densities above 400 kJ/m$^{3}$

Cited by 63 publications

References 20 publications

Predicting the Future of Permanent-Magnet Materials

Predicting the Future of Permanent-Magnet Materials

Novel Bimorphological Anisotropic Bulk Nanocomposite Materials with High Energy Products

Magnetic properties and microstructure of Sm-Co/α-Fe nanocomposite thick film-magnets composed of multi-layers over 700 layers

Contact Info

Product

Resources

About