Evidence for martensitic fcc-bcc transition of thin Fe films on Cu(100)

Kalki, K.; Chambliss, D. D.; Johnson, K.E.; Wilson, Robert; Chiang, S.

doi:10.1103/physrevb.48.18344

Cited by 95 publications

(31 citation statements)

References 11 publications

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“…[2][3][4][5][6][7][8][9][10][11][12] With increasing iron film thickness three different structural modifications are observed. Up to 11 ML Fe, two different fcc phases are stabilized.…”

Section: Introductionmentioning

confidence: 99%

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Antiferromagnetic coupling in fcc Fe overlayers on Ni/Cu(100)

Schirmer

Wuttig

1999

Phys. Rev. B

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Magnetic properties of ultrathin fcc Fe overlayers on Ni/Cu͑100͒ have been determined to study the influence of a magnetic interface. Three regions of different magnetic behavior are distinguished by magneto-optic Kerr ellipsometry, in line with previous studies of Fe/Co/Cu͑100͒ and Fe/Ni/Cu͑100͒. These magnetic states are closely related to the film structure. Above 10 monolayers ͑ML͒, the iron films are homogeneously magnetized and adopt the bcc phase. Very thin films up to 2.5 ML are homogeneously magnetized as well but show an fcc structure in conjunction with a (4ϫ1) reconstruction. The most complex magnetic properties characterize Fe films between 5 and 10 ML. In this thickness range the iron films are not homogeneously magnetized. Instead ferromagnetism is only observed at the Fe film surface and the Fe/Ni film interface. The surface magnetization is apparently correlated with an enlarged atomic volume at the surface and a (2ϫ1) surface reconstruction. Additionally, the magnetic Ni substrate induces ferromagnetic order in the Fe film at the Fe/Ni interface. The coupling of the two ferromagnetic portions of the film shows a strong temperature dependence. This is attributed to the temperature dependence of the bilinear and biquadratic exchange coupling. At low temperature an antiferromagnetic coupling between the two ferromagnetic portions is observed. With increasing temperature this is followed by a canted spin arrangement and finally a ferromagnetic coupling. ͓S0163-1829͑99͒07041-1͔

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“…[2][3][4][5][6][7][8][9][10][11][12] With increasing iron film thickness three different structural modifications are observed. Up to 11 ML Fe, two different fcc phases are stabilized.…”

Section: Introductionmentioning

confidence: 99%

“…The transition to the stable bcc phase of iron is observed above 11 ML. [9][10][11] The transitions between the structural and magnetic phases depend both upon growth temperature and base pressure. 5,13 Such a situation is ideal to explore the possible role of a magnetic interface on the structure and magnetism of thin films.…”

Section: Introductionmentioning

confidence: 99%

Antiferromagnetic coupling in fcc Fe overlayers on Ni/Cu(100)

Schirmer

Wuttig

1999

Phys. Rev. B

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“…Fe and Cr multilayer with body centered cubic (bcc) lattice is well known as the typical system for giant magnetoresistance (GMR) device, showing an in-plane magnetic anisotropy and an oscillatory interlayer magnetic coupling [1][2][3][4]. In contrast to this, Fe films with face centered cubic (fcc) lattice can be stabilized on Cu(001) substrate [5][6][7][8][9][10][11][12]. Up to 4 monolayer (ML), corresponding to the thinnest thickness region of Fe ("region I Fe " hereafter), the films show the face-centered-tetragonal (fct) structure elongated out-of-plane direction and exhibits out-of-plane magnetic anisotropy.…”

Section: Introductionmentioning

confidence: 94%

Growth Mode and Surface Structure of Cr Ultrathin Film on Fe/Cu(001)

Tohoda

Nagira

Ueno

et al. 2008

e-J. Surf. Sci. Nanotechnol.

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We hereby report a growth mode and surface structure of ultrathin Cr films on fcc Fe/Cu(001). We have found a clear RHEED intensity oscillation during Cr deposition up to four monolayers on 3 and 6 ML Fe/Cu(001), indicating an layer-by-layer growth. Besides, the observed (2×1) LEED pattern at low Cr thickness is similar to that of fcc Fe/Cu(001) in the 5-11 ML thickness range. We have also demonstrated the Cr/Fe multilayer growth with single monolayer of Cr inserted between fcc Fe layers.

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“…In the latter case, the transition of the Fe film was described through the formation of shear planes (from the film surface down to the substrate) along close-compact atom rows, which separate domains of different structural phase, like for a martensitic phase transition. 7 Concerning the growth of the newly formed bulk-like Ni domains, a mechanism like that driving the decoherence in semiconductor heteroepitaxy can be envisaged. The domain walls, either shear planes or misfit dislocations, propagate laterally on the Pd substrate, leaving behind a strongly intermixed region.…”

Section: Discussionmentioning

confidence: 99%

“…These metastable artificial phases are decomposed into their ground structural phase when the films exceed a critical thickness of a few layers. These transformations are usually observed to be rather sharp and occur through a rather abrupt non-diffusive distortion mechanism, which is accompanied by a strong morphological reorganization, like for the much studied Fe/Cu(100) system, 7,8 thus smearing the mechanisms of domain growth.…”

Section: Introductionmentioning

confidence: 99%

Pseudomorphic-to-bulk fcc phase transition of thin Ni films on Pd(100)

et al. 2004

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We have measured the transformation of pseudomorphic Ni films on Pd(100) into their bulk fcc phase as a function of the film thickness. We made use of x-ray diffraction and x-ray induced photoemission to study the evolution of the Ni film and its interface with the substrate. The growth of a pseudomorphic film with tetragonally strained face centered symmetry (fct) has been observed by out-of-plane x-ray diffraction up to a maximum thickness of 10 Ni layers (two of them intermixed with the substrate), where a new fcc bulk-like phase is formed. After the formation of the bulklike Ni domains, we observed the pseudomorphic fct domains to disappear preserving the number of layers and their spacing. The phase transition thus proceeds via lateral growth of the bulk-like phase within the pseudomorphic one, i.e. the bulk-like fcc domains penetrate down to the substrate when formed. This large depth of the walls separating the domains of different phases is also indicated by the strong increase of the intermixing at the substrate-film interface, which starts at the onset of the transition and continues at even larger thickness. The bulk-like fcc phase is also slightly strained; its relaxation towards the orthomorphic lattice structure proceeds slowly with the film thickness, being not yet completed at the maximum thickness presently studied of 30Å (∼ 17 layers).

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Evidence for martensitic fcc-bcc transition of thin Fe films on Cu(100)

Cited by 95 publications

References 11 publications

Antiferromagnetic coupling in fcc Fe overlayers on Ni/Cu(100)

Antiferromagnetic coupling in fcc Fe overlayers on Ni/Cu(100)

Growth Mode and Surface Structure of Cr Ultrathin Film on Fe/Cu(001)

Pseudomorphic-to-bulk fcc phase transition of thin Ni films on Pd(100)

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