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Spin-Mixing Conductances of Ni-Based Films Attached to Cu(100) Leads

100%

Turek I., Carva K.

Acta Physica Polonica A

2008

vol. 113

issue 1

11-14

The complex spin-mixing conductance of epitaxial Cu/Ni/Cu(100) systems is predicted to oscillate as a function of Ni thickness. The oscillation period is explained in terms of spin-resolved Fermi surface properties of bulk nickel. Stability of the oscillations with respect to interface Cu-Ni interdiffusion and to alloying in the Ni film is investigated as well.

Inelastic Electron Tunneling Spectroscopy of a Mn Dimer

80%

Delgado F., Fernández-Rossier J.

Acta Physica Polonica A

2012

vol. 122

issue 2

304-306

A scanning tunneling microscope can probe the inelastic spin excitations of single magnetic atoms in a surface via spin-flip assisted tunneling. A particular and intriguing case is the Mn dimer case. We show here that the existing theories for inelastic transport spectroscopy do not explain the observed spin transitions when both atoms are equally coupled to the scanning tunneling microscope tip and the substrate, the most likely experimental situation. The hyperfine coupling to the nuclear spins is shown to lead to a finite excitation amplitude, but the physical mechanism leading to the large inelastic signal observed is still unknown. We discuss some other alternatives that break the symmetry of the system and allow for larger excitation probabilities.

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2 Acta Physica Polonica A

1 2012

1 2008

1 Carva K.

1 Delgado F.

1 Fernández-Rossier J.

1 Turek I.

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Spin-Mixing Conductances of Ni-Based Films Attached to Cu(100) Leads

Inelastic Electron Tunneling Spectroscopy of a Mn Dimer