Antiferromagnetic Structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>-Manganese and a Magnetic Structure Study of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math>-Manganese

Kasper, J. S.; Roberts, B. W.

doi:10.1103/physrev.101.537

Cited by 192 publications

(63 citation statements)

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“…␣-Mn exhibits a complex noncollinear magnetic structure below its critical bulk temperature T c b ϭ100 K. 55,56 We have shown above that ␦-Mn can be stabilized by pseudomorphic growth on W͑110͒ ͑cf. Figs.…”

Section: Theorymentioning

confidence: 99%

Structural, electronic, and magnetic properties of a Mn monolayer on W(110)

et al. 2002

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In this paper we establish a monolayer of Mn on W͑110͒ as a model system for two-dimensional itinerant antiferromagnetism. Combining scanning tunneling microscopy ͑STM͒, low-energy electron diffraction, and ab initio calculations performed with the full-potential linearized augmented plane wave method we have studied the structural, electronic, and magnetic properties of a Mn monolayer on W͑110͒. Our experimental results indicate that in spite of the huge tensile strain Mn grows pseudomorphically on W͑110͒ up to a thickness of three monolayers. Intermixing between the Mn overlayer and the W substrate can be excluded. Using these structural data as a starting point for the ab initio calculations of one monolayer Mn on W͑110͒ we conclude that ͑i͒ Mn is magnetic and exhibits a large magnetic moment of 3.32 B , ͑ii͒ the magnetic moments are arranged in a c(2ϫ2) antiferromagnetic order, ͑iii͒ the easy axis of the magnetization is in plane and points along the ͓11 0͔ direction, i.e., the direction along the long side of the ͑110͒ surface unit cell with a magnetocrystalline anisotropy energy of 1.3-1.5 meV, and ͑iv͒ the Mn-W interlayer distance is 2.14 Å. The calculated electronic structure of a Mn monolayer on W͑110͒ is compared with experimental scanning tunneling spectroscopy results. Several aspects are in nice agreement, but one cannot unambiguously deduce the magnetic structure from such a comparison. The proposed two-dimensional antiferromagnetic ground state of a Mn monolayer on W͑110͒ is directly verified by the use of spin-polarized STM ͑SP-STM͒ in the constant-current mode, and an in-plane easy magnetization axis could be confirmed using tips with different magnetization directions. We compare the measurements with theoretically determined SP-STM images calculated combining the Tersoff-Hamann model extended to SP-STM with the ab initio calculation, resulting in good agreement.

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Section: Theorymentioning

confidence: 99%

Structural, electronic, and magnetic properties of a Mn monolayer on W(110)

et al. 2002

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“…Namely, the main phases, which has been found, are non-modulated tetragonal martensite [19] (L1 0 ordered), cubic -MnO [20], certain amount of 14M martensite [19], and small amount of austenitic L2 1 ordered phase [21]. In addition, several weak peaks could be attributed to -Mn [22]. Four lines of cubic Ni 3 Ga [23] (space group Pm-3m) appeared in spectra, however, no superlattice reflexes were found.…”

Section: Phase Content Of the Sintered Samplesmentioning

confidence: 92%

Mechanical Testing of the Shape-Memory Materials Synthesized by a Plasma-Spark Method

Monastyrsky¹,

Gilchuk²,

Ochin³

et al. 2016

Metallofiz. Noveishie Tekhnol.

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Compression tests are carried out at room temperature with the as-cast and spark-plasma sintered (SPS) specimens of Ni49.0-Mn28.5-Ga22.5 (at.%) and Ni63-Al37 (at.%) alloys. For both systems, ductility of the SPS compacts increases more than by one order of magnitude. Compressive strength of Ni-Mn-Ga alloy increases from 180-240 MPa for induction melted specimens to 510-815 MPa for spark-plasma sintered specimens, depending on the regimes of processing, and for Ni-Al alloy, from 760 to 1310 MPa. Fracture stress of Ni-Mn-Ga and Ni-Al specimens raise from 185-215 to 1170 MPa and from 790 to 1870 MPa, respectively. The SEM and XRD investigations reveal that sintered samples of both systems have a composite structure, which contains the micron-size metallic particles bound by the binder phase. This phase consists of Ni 3 Al and Al 2 O 3 phases in case of Ni-Al alloy and consists of MnO with apparently small amount of Ni 3 Ga phase in case of Ni-MnGa alloy. As assumed, this phase strengthens the grain boundaries. This one, in conjunction with reduction of the grain size, the manifold morphology of the Ni-Mn-Ga specimens consolidated from the hollow particles, the presence of extra ductile -phase in Ni-Al particles, provides the enhancing mechanical properties of alloys fabricated by means of the SPS method. Ga для стопу Ni-Mn-Ga. Передбачається, що ця фаза зміцнює межі зерен. Це разом із зменшенням розміру зерна, а також багатозв'язною морфологією зразків Ni-Mn-Ga, консолідованих із порожнистих части-нок, та наявністю пластичної -фази в частинках Ni-Al покращує меха-нічні властивості стопів, одержаних плазмово-іскровою методою. Випробування на стиснення було виконано при кімнатній температуріИспытания на сжатие были выполнены при комнатной температуре для образцов сплавов Ni49,0-Mn28,5-Ga22,5 (ат.%) и Ni63-Al37 (ат.%), как для выплавленных, так и полученных плазменно-искровым методом (ПИМ). Для обеих систем пластичность ПИМ-образцов возрастает более чем на порядок по сравнению с исходными. Прочность на сжатие сплава Ni-Mn-Ga увеличивается от 180-240 МПа для выплавленных образцов до 510-815 МПа для ПИМ-образцов в зависимости от режимов обработки, для сплава Ni-Al -от 760 до 1310 МПа. Напряжение разрушения образ-цов Ni-Mn-Ga увеличивается от 185-215 до 1170 МПа, а для образцов Ni-Al -от 790 до 1870 МПа. Спечённые образцы обеих систем имеют композитную структуру, образованную из металлических частиц мик-ронных размеров, скреплённых связующей фазой, состоящей из Ni 3 Al и Al 2 O 3 для сплава Ni-Al и из MnO с небольшим количеством Ni 3 Ga для сплава Ni-Mn-Ga. Предполагается, что эта фаза укрепляет границы зё-рен. Это вместе с уменьшением размера зерна, а также многосвязной морфологией образцов Ni-Mn-Ga, консолидированных из полых частиц, и наличием пластической -фазы в частицах Ni-Al улучшает механиче-ские свойства сплавов, полученных плазменно-искровым методом.

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“…These parameters measured by Oberteuffer et al [3] are 1.79μB, 1.41μB, 1.17μB and 0.09μB respectively. Kasper and Roberts [4] offer two sorts of moments: first 1.54B, 1.541B, 3.08μB and 0μB, and second 2.5μ.B, 2.5μB, I.7μB and ΟμB. Other values are given by Kunitomi et al [5] namely: 1.35B, 1.351.13 , 0.99μB and 0.22μB, respectively.…”

Section: (311)mentioning

confidence: 99%

“…[4], every MnI atom with positive polarization is surrounded by a tetrahedron of four MnII atoms with negative polarization, the distance from the central atom being 2.82 Α. Again, every MnII atom is surrounded by six ΜnIII atoms at a distance of 2.48 Α or 2.96 Å, with alternating polarization.…”

Section: Introductionmentioning

confidence: 99%