A low-temperature ultrahigh vacuum scanning tunneling microscope with a split-coil magnet and a rotary motion stepper motor for high spatial resolution studies of surface magnetism

Pietzsch, O.; Kubetzka, André; Haude, D.; Bode, Matthias; Wiesendanger, R.

doi:10.1063/1.1150218

Cited by 110 publications

(31 citation statements)

References 18 publications

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“…Low-temperature measurements were performed instead in a home-built STM which requires a smaller sample size, 43 i.e., a rectangular W͑110͒ substrate with the outer dimensions 3 mm ϫ 7 mm. The average miscut of the latter substrate amounts to 0.5°.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…This microscope was designed for high-spatial-resolution studies of surface magnetism and includes a tip exchange mechanism. 43 For magnetic measurements we used etched W tips which were flashed in vacuo to remove oxide layers. In the metal vapor deposition chamber the tips were magnetically coated with Fe or Gd while held at 300 K, subsequently annealed at TϷ550 K for 4 min, and then transfered into the cryogenic STM.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

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Structural, electronic, and magnetic properties of a Mn monolayer on W(110)

et al. 2002

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In this paper we establish a monolayer of Mn on W͑110͒ as a model system for two-dimensional itinerant antiferromagnetism. Combining scanning tunneling microscopy ͑STM͒, low-energy electron diffraction, and ab initio calculations performed with the full-potential linearized augmented plane wave method we have studied the structural, electronic, and magnetic properties of a Mn monolayer on W͑110͒. Our experimental results indicate that in spite of the huge tensile strain Mn grows pseudomorphically on W͑110͒ up to a thickness of three monolayers. Intermixing between the Mn overlayer and the W substrate can be excluded. Using these structural data as a starting point for the ab initio calculations of one monolayer Mn on W͑110͒ we conclude that ͑i͒ Mn is magnetic and exhibits a large magnetic moment of 3.32 B , ͑ii͒ the magnetic moments are arranged in a c(2ϫ2) antiferromagnetic order, ͑iii͒ the easy axis of the magnetization is in plane and points along the ͓11 0͔ direction, i.e., the direction along the long side of the ͑110͒ surface unit cell with a magnetocrystalline anisotropy energy of 1.3-1.5 meV, and ͑iv͒ the Mn-W interlayer distance is 2.14 Å. The calculated electronic structure of a Mn monolayer on W͑110͒ is compared with experimental scanning tunneling spectroscopy results. Several aspects are in nice agreement, but one cannot unambiguously deduce the magnetic structure from such a comparison. The proposed two-dimensional antiferromagnetic ground state of a Mn monolayer on W͑110͒ is directly verified by the use of spin-polarized STM ͑SP-STM͒ in the constant-current mode, and an in-plane easy magnetization axis could be confirmed using tips with different magnetization directions. We compare the measurements with theoretically determined SP-STM images calculated combining the Tersoff-Hamann model extended to SP-STM with the ab initio calculation, resulting in good agreement.

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Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Structural, electronic, and magnetic properties of a Mn monolayer on W(110)

et al. 2002

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“…The experiments were performed in an ultra-high vacuum (UHV) system consisting of separate chambers for preparation, molecular beam epitaxy (MBE), standard surface analysis, and a chamber for cryogenic STM [21]. The base pressure in all chambers is in the low 10 À11 mbar regime.…”

Section: Methodsmentioning

confidence: 99%

“…After preparation the sample is transferred into the cryogenic STM which is equipped with a tip exchange mechanism [21]. Spin-integrated measurements are performed with W tips.…”

Section: Methodsmentioning

confidence: 99%

Spin-polarized scanning tunneling spectroscopy of dislocation lines in Fe films on W(1 1 0)

Bode¹,

Bergmann²,

Pietzsch³

et al. 2006

Journal of Magnetism and Magnetic Materials

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“…11. STM images are recorded in constant-current mode with the voltage V sample applied to the sample.…”

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confidence: 99%

Direct observation of confined states in metallic single-walled carbon nanotubes

Maltezopoulos¹,

Kubetzka²,

Morgenstern³

et al. 2003

Applied Physics Letters

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We investigated the local density of states ͑LDOS͒ of extended individual metallic single-walled carbon nanotubes using low-temperature scanning tunneling spectroscopy. We observed that the LDOS oscillates with energy close to the Fermi level. The oscillation period of about 50 meV varies with position on the nanotube. Maps of the LDOS reveal that the peaks in the oscillation are related to confined states. The widths of the peaks increase with increasing distance from the Fermi level.

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A low-temperature ultrahigh vacuum scanning tunneling microscope with a split-coil magnet and a rotary motion stepper motor for high spatial resolution studies of surface magnetism

Cited by 110 publications

References 18 publications

Structural, electronic, and magnetic properties of a Mn monolayer on W(110)

Structural, electronic, and magnetic properties of a Mn monolayer on W(110)

Spin-polarized scanning tunneling spectroscopy of dislocation lines in Fe films on W(1 1 0)

Direct observation of confined states in metallic single-walled carbon nanotubes

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