Electric-Field-Induced Magnetic Anisotropy in a Nanomagnet Investigated on the Atomic Scale

Sonntag, A.; Hermenau, Jan; Schlenhoff, Anika; Friedlein, Johannes; Krause, Stefan; Wiesendanger, R.

doi:10.1103/physrevlett.112.017204

Cited by 45 publications

(37 citation statements)

References 28 publications

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“…In thin metallic films 40,41 and clusters, 42 an external electric field can be applied to tune the magnetic anisotropy. For single atoms, so far only static control of the magnetocrystalline anisotropy has been achieved by the selection of the adsorption site on surfaces.…”

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confidence: 99%

Tuning the Magnetic Anisotropy of Single Molecules

et al. 2015

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The magnetism of single atoms and molecules is governed by the atomic scale environment. In general, the reduced symmetry of the surrounding splits the d states and aligns the magnetic moment along certain favorable directions. Here, we show that we can reversibly modify the magnetocrystalline anisotropy by manipulating the environment of single iron(II) porphyrin molecules adsorbed on Pb(111) with the tip of a scanning tunneling microscope. When we decrease the tip-molecule distance, we first observe a small increase followed by an exponential decrease of the axial anisotropy on the molecules. This is in contrast to the monotonous increase observed earlier for the same molecule with an additional axial Cl ligand ( Nat. Phys. 2013 , 9 , 765 ). We ascribe the changes in the anisotropy of both species to a deformation of the molecules in the presence of the attractive force of the tip, which leads to a change in the d level alignment. These experiments demonstrate the feasibility of a precise tuning of the magnetic anisotropy of an individual molecule by mechanical control.

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confidence: 99%

Tuning the Magnetic Anisotropy of Single Molecules

et al. 2015

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“…Experimentally, magnetic properties are often studied using spin-polarised scanning tunneling microscope (STM) [6][7][8][9] under ultra-high vacuum (UHV) conditions. Computational studies based on density functional theory (DFT) are also usually performed in a way that represents vacuum conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of H Adsorption on the Magnetic Properties of an Fe Island on a W(110) Surface

Melander

Jónsson²

2019

Preprint

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<p>Low-dimensional materials, such as ultrathin films, nanoislands and wires, are actively being researched due to their interesting magnetic properties and possible technological applications for example in high density data storage. Results of calculations of an Fe nanoisland on a W(110) support are presented here with particular focus on the effect of hydrogen adsorption on its magnetic properties. This is an important consideration since hydrogen is present even under ultra-high vacuum conditions. The calculations are based on density functional theory within the generalized gradient approximation. The adsorption of H atoms is found to strongly decrease the magnetic moment of the Fe atoms they are bound to, down to less than a half in some cases as compared with the clean Fe island. The results show that it may be important to take the presence of hydrogen into account in measurements of magnetic properties of nanoislands.</p>

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“…The electrical control of magnetism is of crucial importance for its applications. [1][2][3] However, it is extremely challenging to address the spin states of a single-molecule deposited on the surfaces that are attractive for the miniaturization of magnetoelectronic devices [4][5][6][7] and for quantum computations due to their long coherence time. 8 First, the molecules may lose their magnetic behaviors when attached to solid state substrates or electrodes even though the molecules seem to be structurally preserved.…”

Section: Introductionmentioning

confidence: 99%

Single-molecule spin orientation control by an electric field

Zhang

2017

The Journal of Chemical Physics

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We report the effects of an electric field E on the spin orientations of nickelocene (Nc) deposited on the Cu surfaces by means of first-principles calculations. We employ the Hubbard-U corrected van der Waals density functional to take into account the strong correlation effects of the localized 3d electrons and the non-covalent binding involved in the molecule-surface coupling. We show that the deposited Nc molecule can switch between in-plane (in small E-field) and perpendicular magnetization (in large E-field). We find that the significant charge transfer between the molecule and the metallic surface plays a dominant role in the spin reorientation transition. From an electronic structure perspective, the shift in the Fermi level enhances the coupling between the occupied and unoccupied Ni-3d states of different spin states, which tends to facilitate the perpendicular magnetic anisotropy. These findings shed some light on the electrical control of the magnetic anisotropies of single-molecule magnets on metal surfaces.

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Electric-Field-Induced Magnetic Anisotropy in a Nanomagnet Investigated on the Atomic Scale

Cited by 45 publications

References 28 publications

Tuning the Magnetic Anisotropy of Single Molecules

Tuning the Magnetic Anisotropy of Single Molecules

Effect of H Adsorption on the Magnetic Properties of an Fe Island on a W(110) Surface

Single-molecule spin orientation control by an electric field

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