Origin of perpendicular magnetic anisotropy in epitaxial 
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 trilayers

Davydenko, A. V.; Козлов, А. Г.; Ognev, A. V.; Stebliy, Maxim E.; Samardak, Alexander S.; Ermakov, K. S.; Chebotkevich, L. A.

doi:10.1103/physrevb.95.064430

Cited by 28 publications

(23 citation statements)

References 43 publications

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“…This significant increase of hydrogen solubility in Co arises from the strain state of the absorbing Co lattice in the Co/Pd layers, where Co has a large lattice mismatch of ∼9% with Pd. Recent experiments confirmed that four monolayers of Co epitaxially grown on Pd(111) experience a large strain of 4-6%, while a gradual relaxation of the strain takes place for thicker films [39]. Our calculations showed that the absorption energy of H in the fcc Co lattice increases with lattice expansion from −0.02 to −0.49 eV for freestanding strain-free (3.55 Å) and epitaxially strained (3.85 Å) Co layers, respectively (see Fig.…”

Section: Hydrogen Distribution Profiles and Concentration Effect On Magnetic Anisotropy Of Co/pdmentioning

confidence: 97%

“…While the assumption of epitaxial growth is an appealing theoretical idealization, real Co films show some deviations from perfect epitaxial growth [32,39]. The substantial lattice mismatch may cause an introduction of interfacial dislocations to reduce the stress in interior Co planes.…”

Section: Hydrogen Distribution Profiles and Concentration Effect On Magnetic Anisotropy Of Co/pdmentioning

confidence: 99%

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Hydrogen tunes magnetic anisotropy by affecting local hybridization at the interface of a ferromagnet with nonmagnetic metals

Klyukin

Beach

Yildiz

2020

Phys. Rev. Materials

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Ionic control of magnetic properties, dubbed magneto-ionics, has gained much attention in recent years due to the sizable effects that can be induced by electrically controlled ion motion. Here we assess the mechanism by which hydrogen affects magnetic anisotropy in representative ferromagnetic/nonmagnetic metal layers. We take Co/Pd film as a model system that is widely used in spintronics. First-principles calculations demonstrate that the magnetic moment can be switched by 90 • via hydrogen insertion at the Co/Pd interface. This control results from hydrogen-induced changes in magnetic anisotropy originating from modifications to the electronic structure. Accumulation of hydrogen at the Co/Pd interface affects the hybridization between neighboring Co and Pd layers, leading to a decrease of the perpendicular anisotropy component, and eventually changes the net magnetic anisotropy to in-plane. Hydrogen penetration into the interior Co layers has the opposite effect, promoting perpendicular magnetic anisotropy. These changes are governed by competing contributions of the d xy ; d x 2 +y 2 and the 3d z 2 ; 3d zy states, which are mainly responsible for the perpendicular and the in-plane magnetocrystalline anisotropy, respectively. By using this understanding, we predict that hydrogen accumulation at Fe/V interfacial layers causes the opposite spin reorientation effect, promoting perpendicular magnetic anisotropy.

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Section: Hydrogen Distribution Profiles and Concentration Effect On Magnetic Anisotropy Of Co/pdmentioning

confidence: 97%

Section: Hydrogen Distribution Profiles and Concentration Effect On Magnetic Anisotropy Of Co/pdmentioning

confidence: 99%

Hydrogen tunes magnetic anisotropy by affecting local hybridization at the interface of a ferromagnet with nonmagnetic metals

Klyukin

Beach

Yildiz

2020

Phys. Rev. Materials

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“…According to the present theory, increasing interfacial SOC, inducing Co (0001) texture, and promoting Co-O hybridization are conducive to the enhancement of interfacial PMA. [11][12][13][14] In our samples, large SOC in Co/Pd interfaces may induce PMA, which is irrelevant to the plasma etching process. To disentangle the contribution of PMA from Co-oxide substrate and Co/Pd interfaces, we grew (Co/Pd) n multilayers with different n (Co/Pd period number) and measured their out-of-plane hysteresis loops by MOKE microscope, as shown in Figure 5a,b.…”

Section: Resultsmentioning

confidence: 99%

“…The theory of interfacial PMA has been well established, where the strong interfacial spin-orbit coupling (SOC), ferromagnet texture-induced magnetocrystalline anisotropy, and Co-O hybridization facilitate the PMA. [11][12][13][14] Herein, heavy metals were widely used as buffer layers to raise the interfacial SOC and induce certain ferromagnetic layer texture. For example, Pt buffer layer is commonly used to induce Co-based PMA, [15] Ta or W buffer layers are often used for inducing the PMA of CoFeB.…”

Section: Introductionmentioning

confidence: 99%

Plasma Etching‐Assisted Perpendicular Magnetic Anisotropy

Bai

Hao

Zhou

et al. 2021

Physica Status Solidi (a)

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Ferromagnetism with perpendicular magnetic anisotropy (PMA) receives continuous attention. But, the PMA is always limited by materials system, the assistance from suitable buffer layers such as Pt and Ta is essential. A general method for the generation of PMA on various systems is pursued. Herein, it is shown that preparatory plasma etching of oxide substrate produces robust PMA in subsequent grown ferromagnetic multilayers, out‐of‐plane hysteresis loop is rectangular with remanence close to 100%. In contrast, without the preparatory plasma etching, out‐of‐plane hysteresis loop of subsequent grown ferromagnetic multilayers is very oblique, the calculated uniaxial anisotropic constant is one order of magnitude smaller than the former one. The enhancements of PMA are observed in distinct oxide substrates including Si/SiO2, Al2O3, LaAlO3, and MgO, indicating the interfacial plasma etching technique can be used for various oxide substrates to obtain PMA. The promotion of Co–O hybridization is proposed to be the dominant reason for the enhancement of PMA, which is supported by the control experiment. This finding provides opportunity for the formation of interfacial PMA on crystalline oxide substrates, and expands the material selection for achieving PMA.

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“…В большинстве случаев определение константы по-верхностной анизотропии K S проводится косвенным методом через анализ кривых намагничивания [12,16]. Использование данного метода подразумевает введение понятия эффективной магнитной анизотропии K e f f , ко-торая представляет собой сумму объемной K V и поверх-ностной K S анизотропий…”

Section: Introductionunclassified

Спин-волновой резонанс в химически осажденных Fe-Ni пленках: измерения спин-волновой жесткости и константы поверхностной анизотропии

Важенина¹,

Исхаков²,

Чеканова³

2018

Физика Твердого Тела

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Single-layer Fe_ x Ni_1 - x thin magnetic films have been investigated by the spin-wave resonance technique in the entire concentration range. The surface anisotropy and exchange stiffness constants for the films with a Ni content from 30 to 80 at % have been measured from the experimental standing spin wave spectra. The surface exchange spin wave penetration depth δ_ C = 20–30 nm has been determined from the dependences of the surface anisotropy and exchange coupling constants on the Fe_20Ni_80 film thickness in the range of 250–400 nm.

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Origin of perpendicular magnetic anisotropy in epitaxial Pd/Co/Pd(111) trilayers

Cited by 28 publications

References 43 publications

Hydrogen tunes magnetic anisotropy by affecting local hybridization at the interface of a ferromagnet with nonmagnetic metals

Hydrogen tunes magnetic anisotropy by affecting local hybridization at the interface of a ferromagnet with nonmagnetic metals

Plasma Etching‐Assisted Perpendicular Magnetic Anisotropy

Спин-волновой резонанс в химически осажденных Fe-Ni пленках: измерения спин-волновой жесткости и константы поверхностной анизотропии

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