Structural transformations of fcc iron films on Cu(100)

Wuttig, Matthias; Feldmann, B.; Thomassen, J.; May, Falk; Zillgen, H.; Brodde, A.; Hannemann, H.; Neddermeyer, H.

doi:10.1016/0039-6028(93)91472-2

Cited by 103 publications

(29 citation statements)

References 25 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: 98%

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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: 98%

“…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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“…Such surface reconstructions are commonly found in the growth of metastable materials such as, e.g., fcc Fe͑001͒ on Cu͑001͒. 9 From LEED patterns we can determine the in-plane crystal symmetry and interatomic spacing, but no information about the lattice structure parallel to the surface normal is accessible. However, from the energy dependence of the intensity of the mirror beam ͑00-spot͒, the vertical interlayer distance d Ќ can be estimated by a simple kinematical calculation.…”

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confidence: 99%

Exchange anisotropy as a probe of antiferromagnetism in expanded face-centered-tetragonal Mn(001) layers

Wieldraaijer

Jonge

2006

Applied Physics Letters

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Manganese (Mn) grows coherent and with an expanded metastable face-centered-tetragonal (e-fct) structure on ultrathin fct Co(001)∕Cu(001) template layers. From the temperature dependence of the observed unidirectional Mn∕Co interface exchange anisotropy, an antiferromagnetic state with a blocking temperature around 410K is found for a 21 monolayer thick e-fct Mn(001) film. The temperature dependent coercivity enhancement of the Co films, which is induced by the proximity of the antiferromagnetic Mn layer, suggests a Néel temperature above 410K for this Mn phase.

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“…1(b)] corresponds to the bcc phase. This pattern has been explained as the result of the possible arrangements of the bcc structure on fcc (100) substrates [6,18,19] with the Pitsch orientational relationship, in which rows of nearest-neighbor atoms are matched between {011} b bcc and {001} f fcc planes [19]. The latter means that the 111 b direction matches the 110 f axis and four different but geomatrically equivalent variants occur for Fe on Cu(100).…”

Section: Fe Film Growthmentioning

confidence: 99%

“…Driven by the magnetic exchange interaction, bulk Fe crystallizes in a ferromagnetic body-centered cubic (bcc) structure (α-Fe) at room temperature (RT) and exhibits a phase transition to a face-centered cubic (fcc) phase (γ -Fe) at 1184 K, which is stable up to 1665 K. The growth of Fe thin films on Cu(100) favors the epitaxial growth of the fcc phase in the low-thickness range, due to a small lattice mismatch of Cu (a Cu = 3.615Å) and fcc Fe (a fcc-Fe = 3.58Å, extrapolated value at RT). For Fe/Cu(001) grown via thermal evaporation at RT three different regimes have been identified regarding structural and magnetic properties in previous studies [3][4][5][6][7][8][9][10][11][12][13]. A ferromagnetic (FM) phase with perpendicular orientation of the magnetization (regime I) is found for the lowest iron thicknesses, below ≈ 4 monolayers (MLs).…”

Section: Introductionmentioning

confidence: 99%

Strain-induced spin reorientation of bcc-like iron films grown on Cu(001)

et al. 2014

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The in-plane orientation of the magnetization vector M in bcc-like Fe(110) films grown on Cu(001) is determined by means of scanning electron microscopy with polarization analysis. For thicknesses of 2 nm, slightly above the fcc/bcc phase transition, it is found that M is oriented along the 110 directions of the Cu (001) substrate. Following the Pitsch orientational relationship these correspond to magnetically hard 111 and 112 axes of bulk iron. This finding is in strong contrast to the behavior reported for thicker films (above 3 nm) of bcc Fe/Cu(001), where the 100 directions of the substrate are preferred. The role of strain in the iron film is discussed, inferring that the presence of a shear strain is mandatory to explain the spin reorientation via the magnetoelastic contribution to the magnetic anisotropy energy.

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Structural transformations of fcc iron films on Cu(100)

Cited by 103 publications

References 25 publications

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

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

Exchange anisotropy as a probe of antiferromagnetism in expanded face-centered-tetragonal Mn(001) layers

Strain-induced spin reorientation of bcc-like iron films grown on Cu(001)

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