Surface Segregation-Induced Critical Phenomena at FeCo(001) Surfaces

Krimmel, S.; Donner, W.; Nickel, Bert; Dosch, H.; Sutter, C.; Grübel, G.

doi:10.1103/physrevlett.78.3880

Cited by 33 publications

(36 citation statements)

References 14 publications

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“…In these experiments [53,157] critical exponents compatible with the ordinary transition critical behaviour were measured, but at the same time the existence of residual longrange surface order was revealed at temperatures above the bulk critical temperature. This behaviour is readily explained by assuming that a weak surface field exists, yielding a surface structure factor governed by the ordinary behaviour in the case that l ord exceeds the bulk correlation length.…”

Section: Surfaces and Fieldsmentioning

confidence: 99%

Critical phenomena at perfect and non-perfect surfaces

Pleimling¹

2004

J. Phys. A: Math. Gen.

100

135

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Abstract. In the past perfect surfaces have been shown to yield a local critical behaviour that differs from the bulk critical behaviour. On the other hand surface defects, whether they are of natural origin or created artificially, are known to modify local quantities. It is therefore important to clarify whether these defects are relevant or irrelevant for the surface critical behaviour.The purpose of this review is two-fold. In the first part we summarise some of the important results on surface criticality at perfect surfaces. Special attention is thereby paid to new developments as for example the study of surface critical behaviour in systems with competing interactions or of surface critical dynamics. In the second part the effect of surface defects (presence of edges, steps, quenched randomness, lines of adatoms, regular geometric patterns) on local critical behaviour in semi-infinite systems and in thin films is discussed in detail. Whereas most of the defects commonly encountered are shown to be irrelevant, some notable exceptions are highlighted. It is shown furthermore that under certain circumstances non-universal local critical behaviour may be observed at surfaces.

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Section: Surfaces and Fieldsmentioning

confidence: 99%

Critical phenomena at perfect and non-perfect surfaces

Pleimling¹

2004

J. Phys. A: Math. Gen.

100

135

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“…Although Fe and Co are completely miscible in bulk, phase separation has been observed at the surface of an ordered B2 FeCo alloy. 16 In the case of extreme phase separation, the Fe and Co could exhibit rather isolated behavior. Since Curie temperature versus thickness plots suggest that cobalt is magnetically ''dead'' in the submonolayer regime on W͑110͒, 15 phase separation may explain why the behavior and Curie temperatures of these alloy nanowires are so similar to the pure Fe wires studied in Ref.…”

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Ferromagnetism in cobalt–iron alloy nanowire arrays on W(110)

Pierce

Plummer

Shen

2002

Applied Physics Letters

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We have prepared arrays of parallel Fe1−xCox alloy nanowires along the atomic step edges of a miscut W(110) surface. Their magnetic properties have been studied with the surface magneto-optical Kerr effect as a function of the relative concentration of the two materials. At low (<35%) cobalt concentrations, the wire arrays exhibit a ferromagnetic easy axis along the substrate [1 −1 0] direction, which is in the surface plane, but perpendicular to the wires. Unlike the bulk alloy, this system shows a decrease in its Curie temperature as cobalt is added to pure Fe. The Curie temperature drops sharply near x=0.35, indicating that cobalt frustrates magnetic ordering in the system.

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“…In their study, however, a phase separation between Fe and Co as well as an influence of the nanowire configuration could not be excluded. Phase separation due to epitaxial stress has been described theoretically [11] and observed experimentally [12,13]. Thus, it has to be taken into account for all studies on alloy films even when the elements are completely miscible in the bulk.…”

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confidence: 99%