Interfacial orbital preferential occupation induced controllable uniaxial magnetic anisotropy observed in Ni/NiO(110) heterostructures

Zhang, Yujun; Wu, Liang; Ma, Ji; Zhang, Qinghua; Fujimori, A.; Ma, Jing; Lin, Yuanhua; Nan, Ce‐Wen; Sun, Nian X.

doi:10.1038/s41535-017-0020-0

Cited by 12 publications

(5 citation statements)

References 44 publications

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“…10,11 In systems where the AFM magnetic anisotropy energy dominates, the FiM layer spins are pinned toward the direction of the AFM layer raising the magnetic anisotropy of the system through interface exchange coupling. 3,4,12,13 Because the magnetic anisotropy of nanomaterials is highly dependent on the crystalline structure, size, shape, interface quality and composition, having the capability of tailoring such features can be important for achieving robust magnetic anisotropic energies in nanoparticulate heterostructures. 14−18 Initial work in our laboratory has demonstrated that significant coercivity and exchange bias fields are obtainable for NiO-based and Mn incorporated MHNCs.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Multiple benefits of antiferromagnetic (AFM) based MHNCs are evident, including having nonvolatile memories, increased data processing speeds, size miniaturization, and decreased power consumption, thus making them particularly suitable for spintronic devices. ,,, The use of an AFM component, such as CoO, Cr 2 O 3 , MnO, and NiO, in MHNCs is particularly advantageous because it enables the exchange bias effect spin–spin coupling when assembled with a ferro/ferrimagnetic (FM/FiM) component. The exchange bias effect is vital for enabling the manipulation of the magnetic properties of heterostructured magnetic systems. , The interface exchange coupling that drives the exchange bias of AFM/FM or AFM/FiM heterostructured nanocrystal systems can be manipulated to control the magnetic coercivity, spin-state switching times, and to overcome the superparamagnetic limit. , In systems where the AFM magnetic anisotropy energy dominates, the FiM layer spins are pinned toward the direction of the AFM layer raising the magnetic anisotropy of the system through interface exchange coupling. ,,, Because the magnetic anisotropy of nanomaterials is highly dependent on the crystalline structure, size, shape, interface quality and composition, having the capability of tailoring such features can be important for achieving robust magnetic anisotropic energies in nanoparticulate heterostructures. − …”

Section: Introductionmentioning

confidence: 99%

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Tuning Exchange Coupling in NiO-Based Bimagnetic Heterostructured Nanocrystals

Shafe

Hossain

Mayanovic

et al. 2021

ACS Appl. Mater. Interfaces

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A series of bimagnetic heterostructured nanocrystals having an antiferromagnetic NiO core and a ferrimagnetic Mn x Ni1–x O and/or FiM Mn3O4 island nanophase overgrowth has been synthesized under varying aqueous solution pH conditions. The two-step self-assembly process employs a thermal decomposition method to synthesize NiO nanoparticles, followed by growth of the Mn x Ni1–x O and/or Mn3O4 nanophase over the NiO core using hydrothermal synthesis at pH values ranging from 2.4–7.0. The environmentally benign hydrothermal process involves pH control of the protonation vs hydroxylation reactions occurring at the nanoparticle surface. TEM analysis and Rietveld refinement of XRD data show that three distinct types of heterostructured nanocrystals occur: NiO/Mn x Ni1–x O core–shell-like heterostructures at the pH of 2.4, mixed NiO/Mn x Ni1–x O and/or/Mn3O4 core-overgrowth structures for 2.4 < pH < 4.5, and predominantly NiO/Mn3O4 core-island structures for pH > 4.5. The magnetic coercivity and exchange bias of the heterostructured nanocrystals vary systematically with the pH of the aqueous solution used to synthesize the samples. The temperature-dependent magnetization and hysteresis loop data are consistent with the nature of overlayer coverage of the NiO core. Our DFT based calculations show that the Mn x Ni1–x O phase has ferrimagnetic properties with a stable spin orientation along the ⟨111⟩ orientation. Furthermore, the calculations show that the magnetic anisotropy constant (K 1) of the Mn3O4 phase is considerably larger than that of the Mn x Ni1–x O phase, which is confirmed by our experimental results. The coercivity and exchange bias field are the largest for the NiO/Mn3O4 core-island nanocrystals, synthesized at a pH value of 5.0, with robust values of nearly 6 kOe and 3 kOe, respectively. This work demonstrates the tunability of hydrothermal deposition, and concomitant magnetic coercivity and exchange bias properties, of Mn x Ni1–x O and/or Mn3O4 nanophase overgrowth over a NiO core with pH, that makes these heterostructured nanocrystals potentially useful for magnetic device, biomedical, and other applications.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tuning Exchange Coupling in NiO-Based Bimagnetic Heterostructured Nanocrystals

Shafe

Hossain

Mayanovic

et al. 2021

ACS Appl. Mater. Interfaces

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“…Most recently, it has been confirmed both experimentally and theoretically that AFM domain in an antiferromagnet with biaxial anisotropy such as NiO film deposited on SrTiO 3 substrate could be reversed by applied electric current [29,30], which is very meaningful for the development of AFM spintronics. Taking NiO as an example to estimate the real physical values, we set the exchange stiffness A≈5×10 −13 J m −1 , a≈4.2 Å, μ s ≈1.7μ B .…”

Section: Simulation Results and Discussionmentioning

confidence: 89%

Microwave fields driven domain wall motions in antiferromagnetic nanowires

et al. 2018

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In this work, we study the microwave field driven domain wall (DW) motion in an antiferromagnetic nanowire, using the numerical calculations based on a classical Heisenberg spin model with the biaxial magnetic anisotropy. We show that a proper combination of a static magnetic field plus an oscillating field perpendicular to the nanowire axis is sufficient to drive the DW propagation along the nanowire. More importantly, the drift velocity at the resonance frequency is comparable to that induced by temperature gradients, suggesting that microwave field can be a very promising tool to control DW motions in antiferromagnetic nanostructures. The dependences of resonance frequency and drift velocity on the static and oscillating fields, the axial anisotropy, and the damping constant are discussed in details. Furthermore, the optimal orientations of the field are also numerically determined and explained. This work provides useful information for the spin dynamics in antiferromagnetic nanostructures for spintronics applications.

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“…In order to help one to catch up the results easily, we estimate the real value of the domain wall velocity taking NiO as an example [43]. Specifically, for K/K c = 1 × 10 −4 a −1 and α = 0.002, the speed of the wall for NiO with the exchange stiffness A ≈ 5 × 10 −13 J/m, a ≈ 4.2 Å, μ s ≈ 1.7μ B (μ B is the Bohr magneton) is estimated to be ∼100 m/s.…”

Section: Brief Discussionmentioning

confidence: 99%

Ultralow-loss domain wall motion driven by a magnetocrystalline anisotropy gradient in an antiferromagnetic nanowire

Wen

Chen

et al. 2020

Phys. Rev. Research

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Searching for a new scheme to control the antiferromagnetic (AFM) domain wall is one of the most important issues for AFM spintronic devices. In this work, we study theoretically the domain wall motion of an AFM nanowire, driven by the axial anisotropy gradient generated by an external electric field and an electrocontrol of AFM domain wall motion in the merit of ultralow energy loss is demonstrated. The domain wall velocity depending on the anisotropy gradient magnitude and intrinsic material properties is simulated based on the Landau-Lifshitz-Gilbert equation and also deduced using the energy dissipation theorem. It is shown that the domain wall moves at a nearly constant speed for the small anisotropy gradient, and this motion is accelerated for the large gradient due to the enlarged domain wall width. While the domain wall mobility is independent of the lattice dimension and types of the domain wall, it can be enhanced by the Dzyaloshinskii-Moriya interaction. In addition, the physical mechanism for much faster AFM wall dynamics than ferromagnetic wall dynamics is qualitatively explained. This work unveils a promising strategy for controlling the AFM domain walls, benefiting the future of AFM spintronic applications.

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Interfacial orbital preferential occupation induced controllable uniaxial magnetic anisotropy observed in Ni/NiO(110) heterostructures

Cited by 12 publications

References 44 publications

Tuning Exchange Coupling in NiO-Based Bimagnetic Heterostructured Nanocrystals

Tuning Exchange Coupling in NiO-Based Bimagnetic Heterostructured Nanocrystals

Microwave fields driven domain wall motions in antiferromagnetic nanowires

Ultralow-loss domain wall motion driven by a magnetocrystalline anisotropy gradient in an antiferromagnetic nanowire

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