Magnetic coupling of single Co adatoms to a Co underlayer through a Pd spacer of variable thickness

Dzemiantsova, L. V.; Hortamani, Mahboubeh; Hanneken, Christian; Kubetzka, André; Bergmann, Kirsten; Wiesendanger, R.

doi:10.1103/physrevb.86.094427

Cited by 10 publications

(12 citation statements)

References 25 publications

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“…To this end, a proper quantity of external magnetic field can be exerted on the left lead for the generation of spin polarized electron source. As the QD is a zero dimensional nanoscale system, our suggestion is using a magnetic grain, such as Co grain, 33,34 to create magnetic field on the right QD. To explore its effectiveness we estimate the field strength of a typical Co grain which consists of hundreds of atoms.…”

Section: Discussionmentioning

confidence: 99%

Coherent manipulation of a single magnetic atom using polarized single electron transport in a double quantum dot

Lai

Yang

2015

Phys. Rev. B

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We consider theoretically a magnetic impurity spin driven by polarized electrons tunneling through a double quantum dot system. Spin blockade effect and spin conservation in the system make the magnetic impurity sufficiently interact with each transferring electron. As a results, a single collected electron carries information about spin change of the magnetic impurity. The scheme may develop all electrical manipulation of magnetic atoms by means of single electrons, which is significant for the implementation of scalable logical gates in information processing systems.

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Section: Discussionmentioning

confidence: 99%

Coherent manipulation of a single magnetic atom using polarized single electron transport in a double quantum dot

Lai

Yang

2015

Phys. Rev. B

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“…A motivation is the recent observation of magnetic skyrmions in zero magnetic field in atomic Rh/Co bilayers on the Ir(111) surface [16]. On the other hand, for Pd/Co/Ir(111) only ferromagnetic domains have been observed in spin-polarized STM experiments [40]. We start again by discussing the energy dispersion of flat spin spirals for fcc-4d/Co/Ir trilayers before presenting trends for the Heisenberg exchange and HOI parameters of both trilayers and the corresponding film systems for which we have calculated exchange constants and HOI parameters as well.…”

Section: B Co Based Trilayersmentioning

confidence: 99%

“…In this section we show for selected trilayers and film systems to which extent a mixture of both DFT codes -the all-electron FLAPW method as implemented in FLEUR and the PAW method from VASP which is based on pseudopotentials -can be used to obtain the trends of the HOI parameters. We have chosen two systems from the Fe based and Co based series for which the corresponding film systems have already been studied experimentally [13,16,[35][36][37][38]40].…”

Section: Acknowledgmentsmentioning

confidence: 99%

Trends of higher-order exchange interactions in transition-metal trilayers

Gutzeit,

Haldar,

Meyer

et al. 2021

Preprint

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We present a systematic study of higher-order exchange interactions beyond the pair-wise Heisenberg exchange in transition-metal trilayers based on density functional theory calculations. We show that these terms can play an important role in magnetic trilayers composed of a single hexagonal Fe or Co atomic layer sandwiched between 4d and 5d transition-metal layers. We study the dependence of the biquadratic and the three-site and four-site four spin interaction on the band filling of the 4d and 5d layers as well as the stacking sequence, i.e. fcc vs. hcp stacking. Our calculations reveal relatively small higher-order interactions for Co based trilayers. For Fe based trilayers with a Rh or Ir layer the higher-order terms can be on the same order of magnitude as pair-wise Heisenberg exchange. The trends obtained for freestanding trilayers are used to understand the higher-order interactions in ultrathin film systems on surfaces that are experimentally accessible. It is shown that hcp-Rh/Fe/Ir(111) and hcp-Rh/Fe/Rh(111) exhibit the largest values for the biquadratic and the three-site four spin interaction of all systems under study. We further demonstrate that the three-site four spin interaction is responsible for the experimentally observed change of the magnetic ground state of Rh/Fe/Ir(111) from a spin spiral (single-Q) for fcc-Rh to a 2Q state for hcp-Rh. We find similar trends for Rh/Fe/Rh(111), i.e. replacing the Ir surface by the isoelectronic Rh surface. For Rh/Co/Ir(111), we obtain a negative value for the four-site four spin interaction which will lead to a reduced stability of magnetic skyrmions which are metastable in this film at zero magnetic field. In contrast, for Pd/Fe/Ir(111), the four-site four spin interaction is positive which leads to an enhanced stability of skyrmions.

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“…INTRODUÇÃO 5 mento, a comparação entre as bicamadas de Pd/Fe/Ir (111) e Pd/Co/Ir (111). Estaúltima apresenta um estado fundamental ferromagnético [61], e suas propriedades magnéticas locais não foram completamente investigadas até o presente momento, via métodos teóricos.…”

Section: Figure 2 | Distance D and Repunclassified

“…1 O eixo de fácil magnetização out-of-plane encontrado está de acordo com as observações experimentais para a bicamada de Pd/Co/Ir(111) [61].…”

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Estrutura eletrônica e dinâmicas de spins aplicadas a multicamadas metálicas e sistemas nanoestruturados

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Magnetic coupling of single Co adatoms to a Co underlayer through a Pd spacer of variable thickness

Cited by 10 publications

References 25 publications

Coherent manipulation of a single magnetic atom using polarized single electron transport in a double quantum dot

Coherent manipulation of a single magnetic atom using polarized single electron transport in a double quantum dot

Trends of higher-order exchange interactions in transition-metal trilayers

Estrutura eletrônica e dinâmicas de spins aplicadas a multicamadas metálicas e sistemas nanoestruturados

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