Magnetization reversal in CoPt-based hard–soft homocomposites

Alexandrakis, V.; Niarchos, D.; Tsiaoussis, I.; Panagiotopoulos, I.

doi:10.1016/j.jmmm.2007.10.017

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…For Nb contents >10 atom %, the magnetization reversal takes place in two steps (Figure b) demonstrating the presence of a second magnetic phase. , …”

Section: Resultsmentioning

confidence: 95%

“…For Nb contents >10 atom %, the magnetization reversal takes place in two steps (Figure 5b) demonstrating the presence of a second magnetic phase. 21,22 To study this effect, the switching field of the hard phase (H sw H ) was plotted as a function of the ratio of the integrated intensities between (110) FeCo and (114) (FeCo) 3 Nb Bragg peaks (Figure 9), which is taken as being proportional to the volume fraction of cubic FeCo. 17 The reversal field of the hard phase decreases progressively but not linearly as the proportion of the soft phase increases, leading to the conclusion that the composite behaves as a hard−soft system.…”

Section: ■ Resultsmentioning

confidence: 99%

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Combinatorial Development of Fe–Co–Nb Thin Film Magnetic Nanocomposites

et al. 2015

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A Fe-Co-Nb thin film materials library was deposited by combinatorial magnetron sputtering and investigated by high-throughput methods to identify new noncubic ferromagnetic phases, indicating that combinatorial experimentation is an efficient method to discover new ferromagnetic phases adequate for permanent magnet applications. Structural analysis indicated the formation of a new magnetic ternary compound (Fe,Co)3Nb with a hexagonal crystal structure (C36) embedded in an FeCo-based matrix. This nanocomposite exhibits characteristics of a two-phase ferromagnetic system, the so-called hard-soft nanocomposites, indicating that the new phase (Fe,Co)3Nb is ferromagnetic. Magnetic hysteresis loops at various angles revealed that the magnetization reversal process is governed by a domain wall pinning mechanism.

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“…For Nb contents >10 atom %, the magnetization reversal takes place in two steps (Figure b) demonstrating the presence of a second magnetic phase. , …”

Section: Resultsmentioning

confidence: 95%

Section: ■ Resultsmentioning

confidence: 99%

Combinatorial Development of Fe–Co–Nb Thin Film Magnetic Nanocomposites

et al. 2015

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“…Here, M s is the saturation magnetization for CoPt (6.5 × 105 A/m) ( 52 ), ω is the rotation angle determined by imaging, C ( n ) is a shape correction factor [9.09; calculated from ( 28 )], and μ 0 H A is the magnetic field strength (2.5 × 10 −3 kg A −1 s −2 ).…”

Section: Methodsmentioning

confidence: 99%

In situ modulation of intestinal organoid epithelial curvature through photoinduced viscoelasticity directs crypt morphogenesis

et al. 2023

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Spatiotemporally coordinated transformations in epithelial curvature are necessary to generate crypt-villus structures during intestinal development. However, the temporal regulation of mechanotransduction pathways that drive crypt morphogenesis remains understudied. Intestinal organoids have proven useful to study crypt morphogenesis in vitro, yet the reliance on static culture scaffolds limits the ability to assess the temporal effects of changing curvature. Here, a photoinduced hydrogel cross-link exchange reaction is used to spatiotemporally alter epithelial curvature and study how dynamic changes in curvature influence mechanotransduction pathways to instruct crypt morphogenesis. Photopatterned curvature increased membrane tension and depolarization, which was required for subsequent nuclear localization of yes-associated protein 1 (YAP) observed 24 hours following curvature change. Curvature-directed crypt morphogenesis only occurred following a delay in the induction of differentiation that coincided with the delay in spatially restricted YAP localization, indicating that dynamic changes in curvature initiate epithelial curvature–dependent mechanotransduction pathways that temporally regulate crypt morphogenesis.

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“…Experimental energy products, however, turn out to be much lower than the theoretical one, even smaller than the sintered Nd-Fe-B. An energy product paradox is proposed therefore in some literature, which has been intensively studied in both experimental [18][19][20][21][22][23][24] and theoretical [25][26][27][28][29][30][31] works by scientists. Further, the price of rare-earth materials rose rapidly in the last few years, which gives the investigation of the composite nanomagnets another push.…”

Section: Introductionmentioning

confidence: 96%