The electron analogue to the Faraday rotation

Weber, W.; Oberli, D. Y.; Riesen, S.; Siegmann, H. C.

doi:10.1088/1367-2630/1/1/309

Cited by 14 publications

(6 citation statements)

References 15 publications

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“…In principle, four different effects may explain the experimental facts at least qualitatively: (i) electric dipole forces; (ii) current-induced magnetic torque [29]; (iii) coherent spin-rotation at the interface [154]; and (iv) intra-atomic NCM [153]. As already sketched in section 3.2.1 and figure 10 the apex of the tip is probably formed by a small cluster of magnetic material that protrudes from the spherical end of the tip.…”

Section: Spatial Resolutionmentioning

confidence: 99%

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Spin-polarized scanning tunnelling microscopy

2003

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The recent experimental progress in spin-polarized scanning tunnelling microscopy (SP-STM)-a magnetically sensitive imaging technique with ultra-high resolution-is reviewed. The basics of spin-polarized electron tunnelling are introduced as they have been investigated in planar tunnel junctions for different electrode materials, i.e. superconductors, optically excited GaAs, and ferromagnets. It is shown that ferromagnets and antiferromagnets are suitable tip materials for the realization of SP-STM. Possible tip designs and modes of operations are discussed for both classes of materials. The results of recent spatially resolved measurements as performed with different magnetic probe tips and using different modes of operation are reviewed and discussed in terms of applicability to surfaces, thin films, and nanoparticles. The limits of spatial resolution, and the impact of an external magnetic field on the imaging process are debated.

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Section: Spatial Resolutionmentioning

confidence: 99%

“…Another possibility, i.e. coherent spin-rotation, may be caused by the precession of the electron spin around the magnetic field [154]. In an SP-STM experiment it may occur in the vacuum gap between the sample and the tip where the magnetic field can be substantial.…”

Section: Spatial Resolutionmentioning

confidence: 99%

Spin-polarized scanning tunnelling microscopy

2003

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“…Another successful method is transmission of spin-polarized electrons (usually produced with a GaAs source) through freestanding ferromagnetic films [6]. This way, the spin motion which shows up as precession of the electron spin-polarization (ESP) P around the magnetization direction and as relaxation of P towards the magnetization M was investigated [7,8].…”

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confidence: 99%

Spin motion of photoelectrons

et al. 2003

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Ab initio and model calculations demonstrate that the spin motion of electrons transmitted through ferromagnetic films can be analyzed in detail by means of angle-and spin-resolved corelevel photoelectron spectroscopy. The spin motion appears as precession of the photoelectron spin polarization around and as relaxation towards the magnetization direction. In a systematic study for ultrathin Fe films on Pd(001) we elucidate its dependence on the Fe film thickness and on the Fe electronic structure. In addition to elastic and inelastic scattering, the effect of band gaps on the spin motion is addressed in particular.

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“…21 The origin of the motion of the electron-spin polarization in ferromagnetic films is the spin-dependent scattering of electrons within the film and at its surface. 22,23 Supposing a completely spin-polarized electron beam with its initial spin polarization P 0 perpendicular to the magnetization M of the film, the spin part of the incident electron wave function is described by a coherent superposition of a majority-spin ↑ and a minority-spin ↓ wave function ͑with their moments parallel and antiparallel to M, respectively͒ with equal amplitudes. Because of spin-dependent scattering, the spin wave function of the beam after reflection from the film reads: ϰ ͉r ↑ ͉exp͑i ↑ ͒ ↑ + ͉r ↓ ͉exp͑i ↓ ͒ ↓ with ͉r ↑,↓ ͉ and ↑,↓ are, respectively, the moduli and the phases of the spin-dependent reflection amplitudes.…”

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confidence: 99%

“…To observe a maximum spin motion P 0 has to be oriented perpendicularly with respect to M of the film. 22,23 It is only in a noncollinear geometry that M can exert a torque on the spinpolarization vector. Upon reflection from the sample, the specular beam passes through a retarding field energy analyzer.…”

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confidence: 99%

Effect of submonolayer MgO coverages on the electron-spin motion in Fe(001): Experiment and theory

et al. 2010

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It is shown that the spin polarization direction of the reflected electrons on Fe͑001͒ strongly changes with minute amounts of MgO. Our ab initio electronic band structure and spin-dependent electron reflection calculations reveal that the MgO-induced out-of-plane relaxation of the Fe surface layer is responsible for this behavior. Our study points toward the subtle feature that the major change of the spin-dependent electron reflection properties of the Fe͑001͒ surface is already caused by the very first MgO coverage.

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The electron analogue to the Faraday rotation

Cited by 14 publications

References 15 publications

Spin-polarized scanning tunnelling microscopy

Spin-polarized scanning tunnelling microscopy

Spin motion of photoelectrons

Effect of submonolayer MgO coverages on the electron-spin motion in Fe(001): Experiment and theory

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