Influence of the transition metal and of order on the composition profile of Pt80M20(111) (M = Ni, Co, Fe) alloy surfaces: LEED study of Pt80Co20(111)

Gauthier, Yves; Baudoing-Savois, R.; Bugnard, J.M.; Bardi, Ugo; Atrei, A.

doi:10.1016/0039-6028(92)90689-4

Cited by 80 publications

(47 citation statements)

References 15 publications

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“…Whereas for the close-packed (111) face these changes are damped on the fifth level. The presented results are in good agreement with experimental data of concentration profiles which were obtained by means of LEED and LEIS [13,14]. Figure 5.…”

Section: Results Of the Layer-by-layer Reconstructionsupporting

confidence: 89%

“…Probing the surface with primary electrons of 58 eV (corresponding to a probing depth of two atomic monolayers [9]), a р(2х2) structure was found. The appearance of these additional super-structural reflections in a diffraction pattern can be caused by two possible phenomena: chemical ordering at the surface of the alloy and/or a reconstruction of the surface [14].…”

Section: Results Of the Layer-by-layer Reconstructionmentioning

confidence: 99%

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Non-Destructive Surface Analysis by Low Energy Electron Loss Spectroscopy

Tinkov¹

2012

Advanced Aspects of Spectroscopy

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Section: Results Of the Layer-by-layer Reconstructionsupporting

confidence: 89%

Section: Results Of the Layer-by-layer Reconstructionmentioning

confidence: 99%

Non-Destructive Surface Analysis by Low Energy Electron Loss Spectroscopy

Tinkov¹

2012

Advanced Aspects of Spectroscopy

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“…Большинство существующих работ по сплавам Pt-Co, в частно-сти по модельному сплаву Pt 80 Co 20 (111), посвящены изучению, главным образом, профиля концентрации в поверхностном слое ме-тодом дифракции медленных электронов и ионизационной спек-троскопии [8,9].…”

Section: Introductionunclassified

Formation of Plasmons in Secondary-Electron Emission Spectra at a Low-Energy Electron Radiation of a Surface of a Pt$_{80}$Co$_{20}$(111) Alloy

Vasylyev¹,

Tin’kov²,

Chervonny³

2006

Usp. Fiz. Met.

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Методом низкоэнергетической спектроскопии характеристических потерь энергии электронов исследовано формирование плазмонов в спектрах вто-рично-электронной эмиссии в упорядочивающемся сплаве Pt 80 Co 20 (111). Предложен способ определения границы раздела «поверхность-объем» по зависимостям интенсивности линий поверхностных и объемных плазмо-нов от энергий первичных электронов в диапазоне 150-700 эВ. Найдено, что толщина приповерхностного наноразмерного слоя для неупорядочен-ного сплава Pt 80 Co 20 (111) больше в 2 раза, чем для упорядоченного состоя-ния. Установлено также, что при упорядочении данного сплава в плазмен-ных колебаниях принимает участие большее количество электронов про-водимости.Методою низькоенергетичної спектроскопії характеристичних втрат ене-ргії електронів досліджено формування плазмонів у спектрах вторинної електронної емісії у стопі Pt 80 Co 20 (111), що упорядковується. Запропоно-вано спосіб визначення роздільчої межи «поверхня-об'єм» за залежнос-тями інтенсивности ліній поверхневих та об'ємних плазмонів від енергій первинних електронів у діяпазоні 150-700 еВ. Знайдено, що товщина приповерхневого нанорозмірного шару для невпорядкованого стопу Pt 80 Co 20 (111) вдвічі більше, ніж для впорядкованого стану. Встановлено також, що при впорядкуванні даного стопу в плазмових коливаннях бере участь більша кількість електронів провідности.A method of the electron energy loss spectroscopy is used to investigate a manifestation of the plasmons in the secondary electron emission spectra for the ordering Pt 80 Co 20 (111) alloy. The method is offered for determination of a 'surface-bulk' boundary based on the dependences of line intensities of the surface and bulk plasmons on the primary-electron energies within the range of 150-700 eV. As revealed, the thickness of nanosize surface layer for the disordered Pt 80 Co 20 (111) alloy is twice as much than thickness for the ordered

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“…The reason for an increased Curie temperature in quenched, disordered samples is the increased number of Co-Co direct exchange couplings relative to the ordered state. This temperature shift already allows a rough estimate of (9). Suppose, for example, the magnetic field is strong enough to drive the magnetic moment M to values near its saturation value M s .…”

Section: Interplay Of Structural and Magnetic Order In The Bulkmentioning

confidence: 99%

“…The linear combinations I = (V AA + V BB − 2V AB )/4, h = V BB − V AA and V 0 = (V AA + V BB )/2 determine the bulk ordering temperature T 0 = 1.83I/k B [8], the degree of surface segregation of one atomic species and the average atomic binding energy, respectively. Following previous work [4], we adapt our model to CoPt 3 (A = Co, B = Pt), where T 0 ≃ 960 K, and Pt-surface segregation is strong (nearly 100 % [9]). Compatible parameters are I = 1, h ≃ 4 and V 0 ≃ −5, where we have used k B T 0 /1.83 ≃ 45 meV, corresponding to 523 K, as our energy unit.…”

Section: Definition Of the Modelmentioning

confidence: 99%

Influence of external magnetic fields on the growth of alloy nanoclusters

Einax

Heinrichs

Maass

et al. 2007

J. Phys.: Condens. Matter

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Abstract. Kinetic Monte Carlo simulations are performed to study the influence of external magnetic fields on the growth of magnetic fcc binary alloy nanoclusters with perpendicular magnetic anisotropy. The underlying kinetic model is designed to describe essential structural and magnetic properties of CoPt 3 -type clusters grown on a weakly interacting substrate through molecular beam epitaxy. The results suggest that perpendicular magnetic anisotropy can be enhanced when the field is applied during growth. For equilibrium bulk systems a significant shift of the onset temperature for L1 2 ordering is found, in agreement with predictions from Landau theory. Stronger field induced effects can be expected for magnetic fcc-alloys undergoing L1 0 ordering.

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Influence of the transition metal and of order on the composition profile of Pt80M20(111) (M = Ni, Co, Fe) alloy surfaces: LEED study of Pt80Co20(111)

Cited by 80 publications

References 15 publications

Non-Destructive Surface Analysis by Low Energy Electron Loss Spectroscopy

Non-Destructive Surface Analysis by Low Energy Electron Loss Spectroscopy

Formation of Plasmons in Secondary-Electron Emission Spectra at a Low-Energy Electron Radiation of a Surface of a Pt$_{80}$Co$_{20}$(111) Alloy

Influence of external magnetic fields on the growth of alloy nanoclusters

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