Interlayer exchange coupling in Pt/Co/Ru and Pt/Co/Ir superlattices

Karayev, Sabit; Murray, Peyton D.; Khadka, Durga; Thapaliya, T. R.; Li, Kai; Huang, Sunxiang

doi:10.1103/physrevmaterials.3.041401

Cited by 18 publications

(17 citation statements)

References 36 publications

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“…For a Co monolayer on Pt(111) we obtain that the ground state is ferromagnetic due to the large isotropic exchange coupling between the Co atoms and that the preferred rotational sense of the in-plane DM vector is left-handed, in agreement with previous theoretical works [34][35][36] and with experiment [37]. We show that a Ru overlayer reduces the Co-Co exchange coupling and increases the in-plane DM interaction, thus the Ru/Co/Pt layer sequence can be an important component of the novel functional multilayer structures [38,39]. Room temperature skyrmions were observed in Ir/Fe/Co/Pt multilayers [40][41][42] and stable skyrmionic states in 4d/Fe 2 /5d multilayers were predicted theoretically [43].…”

Section: Introductionsupporting

confidence: 91%

Spin-spiral formalism based on the multiple-scattering Green's function technique with applications to ultrathin magnetic films and multilayers

Simon

Szunyogh

2019

Phys. Rev. B

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Based on the Korringa-Kohn-Rostoker Green's function technique we present a computational scheme for calculating the electronic structure of layered systems with homogeneous spin-spiral magnetic state. From the self-consistent non-relativistic calculations the total energy of the spinspiral states is determined as a function of the wave vector, while a relativistic extension of the formalism in first order of the spin-orbit coupling gives an access to the effect of the Dzyaloshinskii-Moriya interactions. We demonstrate that the newly developed method properly describes the magnetic ground state of a Mn monolayer on W(001) and that of a Co monolayer on Pt(111). The obtained spin-spiral energies are mapped to a classical spin model, the parameters of which are compared to those calculated directly from the relativistic torque method. In case of the Co/Pt(111) system we find that the isotropic interaction between the Co atoms is reduced and the Dzyaloshinskii-Moriya interaction is increased when capped by a Ru layer. In addition, we perform spin-spiral calculations on Ir/Fe/Co/Pt and Ir/Co/Fe/Pt multilayer systems and find a spin-spiral ground state with very long wavelength due to the frustrated isotropic couplings between the Fe atoms, whereas the Dzyaloshinskii-Moriya interaction strongly depends on the sequence of the Fe and Co layers. :1907.13328v1 [cond-mat.mtrl-sci] arXiv

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Section: Introductionsupporting

confidence: 91%

Spin-spiral formalism based on the multiple-scattering Green's function technique with applications to ultrathin magnetic films and multilayers

Simon

Szunyogh

2019

Phys. Rev. B

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“…Both the extracted period of the oscillation as well as the RKKY coupling strength remain valid when considering an IDMI in the stack, as is discussed in Supplemental Material Sec. SV [44], and are in agreement with values found in literature [36,37,45].…”

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confidence: 92%

Magnetic Chirality Controlled by the Interlayer Exchange Interaction

et al. 2020

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“…The theory describes the periodic behavior well and a maximum ferromagnetic coupling of approximately 0.4 mJ m −2 is obtained at t = 0.85 nm. Both the extracted period of the oscillation as well as the RKKY coupling strength are in agreement with values found in literature [37,38,45].…”

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confidence: 90%

Magnetic chirality controlled by the interlayer exchange interaction

Meijer,

Lucassen,

Kloodt-Twesten

et al. 2019

Preprint

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Chiral magnetism, wherein there is a preferred sense of rotation of the magnetization, has become a key aspect for future spintronic applications. It determines the chiral nature of magnetic textures, such as skyrmions, domain walls or spin spirals, and a specific magnetic chirality is often required for spintronic applications. Current research focuses on identifying and controlling the interactions that define the magnetic chirality. The influence of the interfacial Dzyaloshinskii-Moriya interaction (iDMI) and, recently, the dipolar interactions have previously been reported. Here, we experimentally demonstrate that an indirect interlayer exchange interaction can be used as an additional tool to effectively manipulate the magnetic chirality. We image the chirality of magnetic domain walls in a coupled bilayer system using scanning electron microscopy with polarization analysis (SEMPA). Upon increasing the interlayer exchange coupling, we induce a transition of the magnetic chirality from clockwise rotating Néel walls to degenerate Bloch-Néel domain walls and we confirm our findings with micromagnetic simulations. In multi-layered systems relevant for skyrmion research a uniform magnetic chirality across the magnetic layers is often desired. Additional simulations show that this can be achieved for reduced iDMI values when exploiting the interlayer exchange interaction. This work opens up new ways to control and tailor the magnetic chirality by the interlayer exchange interaction.

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Interlayer exchange coupling in Pt/Co/Ru and Pt/Co/Ir superlattices

Cited by 18 publications

References 36 publications

Spin-spiral formalism based on the multiple-scattering Green's function technique with applications to ultrathin magnetic films and multilayers

Spin-spiral formalism based on the multiple-scattering Green's function technique with applications to ultrathin magnetic films and multilayers

Magnetic Chirality Controlled by the Interlayer Exchange Interaction

Magnetic chirality controlled by the interlayer exchange interaction

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