Domain Wall Manipulation with a Magnetic Tip

Stapelfeldt, T.; Wieser, Robert; Vedmedenko, E. Y.; Wiesendanger, R.

doi:10.1103/physrevlett.107.027203

Cited by 12 publications

(8 citation statements)

References 18 publications

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“…For the spin dynamics calculations [23] the motion of each dipole on a lattice has been described by the generalized Landau-Lifshitz-Gilbert equation at zero temperature:…”

Section: Simulation Methodsmentioning

confidence: 99%

Minimal radius of magnetic skyrmions: statics and dynamics

et al. 2016

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In a broad range of applied magnetic fields and material parameters isolated magnetic skyrmions condense into skyrmion lattices. While the geometry of isolated skyrmions and their lattice counterparts strongly depend on field and Dzyaloshinski-Moriya interaction, this issue has not been adequately addressed in previous studies. Meanwhile, this information is extremely important for applications, because the skyrmion size and the interskyrmion distance have to be tuned for skyrmion based memory and logic devices. In this investigation we elucidate the size and density-dependent phase diagram showing traditional phases in field versus material parameters space by means of Monte-Carlo simulations on a discrete lattice. The obtained diagram permits us to establish that, in contrast to the continuum limit, skyrmions on a discrete lattice cannot be smaller than some critical size and have a very specific shape. These minimal skyrmions correspond to the micromagnetic configuration at the energy barrier between the ferromagnetic and the skyrmionic states. Furthermore, we use atomistic Landau-Lifshitz-Gilbert simulations to study dynamics of the skyrmion annihilation. It is shown that this procees consists of two stages: the continuous skyrmion contraction and its discontinuous annihilation. The detailed analysis of this dynamical process is given.

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“…For the spin dynamics calculations [23] the motion of each dipole on a lattice has been described by the generalized Landau-Lifshitz-Gilbert equation at zero temperature:…”

Section: Simulation Methodsmentioning

confidence: 99%

Minimal radius of magnetic skyrmions: statics and dynamics

et al. 2016

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“…If a certain model Hamiltonian is associated with H and P, the evaluation of expectation values with (6) and (7) can be calculated with different numerical methods. Some other examples to which this approach can be applied can be found in [15][16][17][18][19]. To make a connection to the more common theoretical models for SP-STM, we note that P could, for example, be given by a kind of s-d interaction or the Tersoff-Hamann model.…”

Section: Methodsmentioning

confidence: 99%

Non-equilibrium finite temperature dynamics of magnetic quantum systems: applications to spin-polarized scanning tunneling microscopy

et al. 2013

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We calculated the real-time non-equilibrium dynamics of quantum spin systems at finite temperatures. The mathematical framework originates from the C * -approach to quantum statistical mechanics and was applied to the samples investigated by means of spin-polarized scanning tunneling microscopy. Quantum fluctuations around thermal equilibrium were analyzed and calculated. The time-averaged expectation values agree with the time-averaged experimental data for magnetization curves. The method was used to investigate the dynamics of a sample for shorter times than the resolution time of the experimental setup. Furthermore, predictions of the relaxation times of single spins on metallic and semiconductor surfaces are made. To check the validity of our model, we compared our results with experimental data obtained from Fe adatoms on InSb and from Co adatoms on Pt(111) and found good agreement. Approximated thermalization was found numerically for the expectation values of the spin operators.

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“…2b) Despite the creation and annihilation of Skyrmions the scanning tunneling microscope can be also used to move Skyrmions. The possibility to shift domain walls has been discussed in [22,23]. Fig.…”

Section: The First Step Toward This Direction Has Been Already Done mentioning

confidence: 99%

Manipulation of magnetic skyrmions with a scanning tunneling microscope

2017

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The dynamics of a single magnetic Skyrmion in an atomic spin system under the influence of Scanning Tunneling Microscope is investigated by computer simulations solving the LandauLifshitz-Gilbert equation. Two possible scenarios are described: manipulation with aid of a spinpolarized tunneling current and by an electric field created by the scanning tunneling microscope.The dynamics during the creation and annihilation process is studied and the possibility to move single Skyrmions is showed.

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Domain Wall Manipulation with a Magnetic Tip

Cited by 12 publications

References 18 publications

Minimal radius of magnetic skyrmions: statics and dynamics

Minimal radius of magnetic skyrmions: statics and dynamics

Non-equilibrium finite temperature dynamics of magnetic quantum systems: applications to spin-polarized scanning tunneling microscopy

Manipulation of magnetic skyrmions with a scanning tunneling microscope

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