Surface reconstruction of clean bcc-Fe{110}: A quasi-hexagonal top-layer with periodic height modulation

Yamada, Toyo Kazu; Tamura, Hitoshi; Shishido, M.; Irisawa, Toshiharu; Mizoguchi, Tadashi

doi:10.1016/j.susc.2008.11.010

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…It has been found that the surface structure obtained in the present study is different from those of the bulk metallic iron 2,3) and other iron oxides such as Fe 3 O 4 4-8) and Fe 2 O 3 , [9][10][11] which have been investigated on the various crystallographic orientations. Therefore, the composition of observed surface remains Fe 1Ϫx O, and is not changed to Fe or other iron oxides by annealing.…”

Section: Discussioncontrasting

confidence: 54%

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Nonstoichiometric Wüstite (001) Surface Exposing Defect Clusters

et al. 2011

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The (001) surface of nonstoichiometric wüstite (Fe 0.94 O) grown by the floating zone technique was investigated using STM, LEED and AES. Two distinctive structures, i.e., the dents arrangement and the FeO(001)-c(4ϫ2) reconstructed structure coexist on the terrace after annealing at 1 073 K in the ultrahigh vacuum (UHV) system. On the other hand, the only dents exist after annealing at 1 273 K. The dent is the Fe vacancy pair in the rocksalt-type FeO(001)-(1ϫ1) matrix, which is the exposed PЈ phase of the defect cluster due to nonstoichiometry.

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Section: Discussioncontrasting

confidence: 54%

“…The surface structures on the bulk of the metallic iron 2,3) and other iron oxides such as Fe 3 O 4 4-8) and Fe 2 O 3 9-11) have been investigated on the various crystallographic orientations. However, there are only limited reports on the surface of the bulk Fe 1Ϫx O.…”

Section: Introductionmentioning

confidence: 99%

Nonstoichiometric Wüstite (001) Surface Exposing Defect Clusters

et al. 2011

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“…Especially at surfaces, interfaces and nanometer scale regimes, the phase diagram of iron is drastically changed due to the break of symmetry, causing unique features. Recently, a surface reconstruction on the surface of a bcc-Fe(110) whisker single crystal was found, 9) where the top atomic layer has a fcc(111)-like quasi-hexagonal symmetry and interacts with the sub-surface bcc(110) symmetry, causing a Moire ´-like pattern. In Fe nano-islands grown on a Cu(111) substrate, the coexistence of bcc(110) and fcc(111) phases was found.…”

Section: Introductionmentioning

confidence: 99%

Electric Field Control of Fe Nano Magnets: Towards Metallic Nonvolatile Data Storage Devices

Yamada

Gerhard

Balashov

et al. 2011

Jpn. J. Appl. Phys.

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Magnetoelectric coupling at metal surfaces opens up a new possibility for metallic nonvolatile magnetic data-storage devices, in which the magnetic bits are controlled by an electric field. We studied the atomic and magnetic order in bilayer Fe nano-islands grown on a Cu(111) substrate with a scanning tunneling microscopy setup in ultra high vacuum at 4.5 K. Electric field pulses (108–109 V/m) were found to be able to cause a displacement of the Fe atoms, switching simultaneously the crystalline and the magnetic order, which is the prove of magnetoelectric coupling at the metallic Fe surface. We also succeeded in controlling the direction of the switching by the polarity of the electric field.

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“…In this study, a clean and atomically flat bcc-Fe(001) whisker grown via chemical vapor deposition (CVD) was used as a substrate. [1][2][3][4][18][19][20] We investigated different ironoxide phases that form depending on the substrate temperature (T S ) during oxidization as well as different annealing temperatures after the oxidization. All experiments were performed with a home-built UHV-STM setup at 300 K.…”

Section: Introductionmentioning

confidence: 99%

Temperature control of the growth of iron oxide nanoislands on Fe(001)

Yamada

Sakaguchi

Gerhard

et al. 2016

Jpn. J. Appl. Phys.

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The control of atomically flat interfaces between iron (Fe) and insulating oxide films, such as the Fe/MgO(001) interface, is crucial for tunnel-magnetoresistance (TMR) devices. However, the realization of an ideal atomically flat and clean interface is rather difficult since iron easily binds to impurities such as oxygen. Atomic step defects and iron oxide at the interface could reduce TMR. In this study, the oxidization of an atomically flat and clean Fe(001)-whisker single crystal at different substrate and annealing temperatures was investigated with an ultrahigh-vacuum scanning tunneling microscope (STM). Annealing up to a temperature of 850 K was required to obtain ordered and atomically flat Fe(001)-p(1×1)O terraces after the oxidization with the coexistence of Fe–O nanoislands (∼1 nm in height, ∼50 nm in size). We found that the growth of such nanoislands, which enhances interface roughness, strongly depends on the substrate temperature (T S) during the oxidization. A T S lower than 300 K reduces the coverage by the nanoislands to less than 10%.

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Surface reconstruction of clean bcc-Fe{110}: A quasi-hexagonal top-layer with periodic height modulation

Cited by 7 publications

References 22 publications

Nonstoichiometric Wüstite (001) Surface Exposing Defect Clusters

Nonstoichiometric Wüstite (001) Surface Exposing Defect Clusters

Electric Field Control of Fe Nano Magnets: Towards Metallic Nonvolatile Data Storage Devices

Temperature control of the growth of iron oxide nanoislands on Fe(001)

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