De Magnete et Meteorite: Cosmically Motivated Materials

Lewis, L. H.; Pinkerton, F. E.; Bordeaux, N.; Mubarok, Arif; Poirier, Éric; Goldstein, Joseph I.; Skomski, Ralph; Barmak, K.

doi:10.1109/lmag.2014.2312178

Cited by 58 publications

(51 citation statements)

References 12 publications

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“…2,7 Therefore, the ordered phase of FeNi has drawn renewed attention as a novel alternate to rare earth based permanent magnets. [8][9][10][11] The theoretical maximum magnetic energy product of L1 0 FeNi (∼42 MGOe) is close to that of the currently available best hard magnets. 10,11 It is to be noted that the tetrataenite (L1 0 FeNi phase) was formed during extremely slow cooling of billions of years in the universe.…”

Section: Introductionsupporting

confidence: 70%

“…[8][9][10][11] The theoretical maximum magnetic energy product of L1 0 FeNi (∼42 MGOe) is close to that of the currently available best hard magnets. 10,11 It is to be noted that the tetrataenite (L1 0 FeNi phase) was formed during extremely slow cooling of billions of years in the universe. 8 A brief history of the investigation on tetrataenite has been reviewed in the literature.…”

Section: Introductionsupporting

confidence: 70%

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Crystallization induced ordering of hard magnetic L1 phase in melt-spun FeNi-based ribbons

et al. 2016

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The microstructure of newly developed hard magnetic Fe42Ni41.3SixB12-xP4Cu0.7 (x = 2 to 8 at%) nanocrystalline alloy ribbons has been studied by transmission electron microscopy (TEM) and electron diffraction. A high-density polycrystalline grains, ∼30 nm in size, were formed in a ribbon after annealing at 673 K for 288 hours. Elemental mapping of the annealed specimen revealed the coexistence of three regions, Fe-rich, Ni-rich, and nearly equiatomic Fe-Ni, with areal fractions of 37%, 40%, and 23 %, respectively. The equiatomic L10-type ordered phase of FeNi was detected in between the Fe and Ni-rich phases. The presence of superlattice reflections in nanobeam electron diffraction patterns confirmed the formation of the hard magnetic L10 phase beyond any doubt. The L10 phase of FeNi was detected in alloys annealed in the temperature range of 673 to 813 K. The present results suggest that the order-disorder transition temperature of L10 FeNi is higher than the previously reported value (593 K). The high diffusion rates of the constituent elements induced by the crystallization of an amorphous phase at relatively low temperature (∼673K) are responsible for the development of atomic ordering in FeNi.

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Section: Introductionsupporting

confidence: 70%

Section: Introductionsupporting

confidence: 70%

Crystallization induced ordering of hard magnetic L1 phase in melt-spun FeNi-based ribbons

et al. 2016

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“…14 The anisotropy field is modestly smaller than the previous estimate. 15 Together these data yield an anisotropy constant K ¼ 0.84 MJ/m 3 . This value falls into the range of K values reported by Kojima et al 7 for artificially grown ordered FeNi films of different Fe/Ni compositions, but it is somewhat less than the value of K 1 ¼ 1.3 MJ/m 3 obtained by Pauleve in neutron-irradiated bulk FeNi.…”

mentioning

confidence: 82%

“…13 Our previous studies of NWA 6259 have confirmed via transmission electron microscopy (TEM) the presence of L1 0 FeNi with at least two variants of the c-axis orientation, correlated the intrinsic magnetic properties with the microstructure of bulk tetrataenite, 14 and revealed the extraordinary temperature stability of the magnetic properties. 15 In the latter paper, hard-direction magnetization data were used to estimate the anisotropy field of the NWA 6259 tetrataenite as H a ¼ 20 6 3 kOe, most likely toward the lower end of the range ($17 kOe). In this report, we use a much more extensive set of magnetization data taken at 15 intervals over a 180 rotation of the sample to extract a substantially more rigorous estimate of H a .…”

mentioning

confidence: 99%

“…The Pauleve result 4 suggests that higher (BH) max may be possible if H a can be increased through compositional modification. Furthermore, in contrast to Nd-Fe-B, the hard magnetic properties of tetrataenite vary only weakly with temperature, 15 making L1 0 FeNi a very attractive candidate for high temperature applications. This work was supported by ARPA-E REACT Grant No.…”

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confidence: 99%

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