Epitaxial growth of (001) and (111) Ni films on MgO substrates

Lukaszew, R. A.; Stoica, Vladimir; Uher, Ctirad; Clarke, Roy

doi:10.1557/proc-648-p3.29

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…Similar films could also be used as templates for patterned growth of functional thin films such as NiTi, where a change in grain size can trigger a change in phase composition and the attendant mechanical properties . We also note that by using buffer layers (e.g., Ag) on Si or employing other substrates (MgO and Al 2 O 3 ), this method can be extended to a considerably larger number of metallic and metallic alloy systems and crystal orientations. − Finally, although physical vapor deposition methods such as sputtering can only be used to create multimodal films of limited thickness (tens of μm), these films can be used as templates for electrodeposition, , paving the way for producing thick metallic sheets with intricate microstructures.…”

Section: Discussionmentioning

confidence: 99%

Synthesis of Heterostructured Metallic Films with Precisely Defined Multimodal Microstructures

Berlia

Rajagopalan

2021

ACS Appl. Mater. Interfaces

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Heterostructured materials (e.g., metals with multimodal microstructures) offer the promise of unprecedented functionality and performance by avoiding trade-offs between competing properties such as strength and ductility. However, methods to reproducibly synthesize heterostructured materials with explicit microstructural control are still elusive, and therefore optimizing their mechanical and functional properties via microstructural engineering is presently infeasible. Here, we describe a broadly applicable method to synthesize metallic films with precisely defined multimodal microstructures. This method enables explicit control of the size, volume fraction, and spatial connectivity of fine and coarse grains by exploiting two distinct forms of film growth (epitaxial and Volmer–Weber) simultaneously. We fabricated Cu and Fe films with bimodal and multimodal microstructures using this method and investigated their mechanical properties, which reveals a hitherto unknown breakdown in the strength–ductility synergy produced by such microstructures at small sample dimensions. Our approach enables systematic design of multimodal microstructures to tailor the mechanical properties of metallic materials and provides a platform to create functional thin films and 2D materials with prescribed phase morphologies and microstructures.

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Section: Discussionmentioning

confidence: 99%

Synthesis of Heterostructured Metallic Films with Precisely Defined Multimodal Microstructures

Berlia

Rajagopalan

2021

ACS Appl. Mater. Interfaces

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“…Prior to initiating the growth, the substrate temperature was lowered to the appropriate deposition temperature for metal growth [T ≈ 150 ºC for (001) and T ≈ 300 ºC for (111) oriented Ni films]. 24,26 Heat transfer was by direct radiation between heater and MgO substrate. The surface morphology of the as-deposited and annealed films was determined in-situ with scanning tunneling microscopy (STM).…”

Section: Methodsmentioning

confidence: 99%

Self-assembled NiO nano-wires on epitaxial Ni films

2005

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In-situ annealed epitaxial (001) Ni films MBE grown on MgO substrates exhibit a missing-row (2x1) surface reconstruction due to oxygen adsorption. Thus, the resulting nano-patterning of the surface consists of self-assembled NiO nano-wires. Correlated RHEED, STM, XTEM, PNR and MOKE studies indicate that there is intermixing of the Ni film and the substrate with NiO formation at the interface between film and substrate and also on the surface of the films. This leads to the presence of an additional uniaxial magnetic anisotropy superimposed to the expected 4-fold magneto-crystalline anisotropy as determined with longitudinal MOKE.

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“…Thus, we have considered the growth of magnetic films on MgO substrates, which can be prepared with very smooth surfaces. [3] Here we report on the magnetic switching behavior of these thin films. Our studies reveal the existence of a second-order transition from a single-domain state to a symmetry-broken multidomain state, which leads to singularities in the switching field along specific in-plane crystallographic directions, similarly to what we have observed for epitaxial Co/Cu multilayers and Co thin films grown on silicon.…”

Section: Introductionmentioning

confidence: 95%

Magnetic characterization of (001) and (111) Ni films epitaxially grown on MgO

2001

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One interesting application of epitaxial magnetic thin films is to use them as one of the electrodes in a spin-dependent tunneling junction, in order to use the magnetocrystalline anisotropy to define the required two states of the magnetization.[1] In our preliminary work, we prepared epitaxial magnetic films on copper buffer layers grown on silicon substrates.[2] The single crystalline quality of the films was particularly evident in the magnetization hysteresis loops, showing a sharp reversal at fairly high fields (120 Oe), when the samples were magnetized along the crystallographic easy axis. One technological disadvantage in this type of samples is the chemical interaction between the metallic layers and the silicon substrate.In order to explore the possibility of epitaxial magnetic films on less reactive substrates, we studied the growth on MgO substrates. We have shown that it is possible to obtain epitaxial (001) and (111) Ni films grown on MgO substrates.[3] In particular we observed that the crystalline quality of the films improved considerably after 10 nm of film growth. We will now present our studies on the magnetic properties of these films, particularly the azimuthal dependence of the magnetization reversal using MOKRE, correlating our finding with the structural characterization obtained with RHEED, STM and XRD.

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Epitaxial growth of (001) and (111) Ni films on MgO substrates

Cited by 7 publications

References 11 publications

Synthesis of Heterostructured Metallic Films with Precisely Defined Multimodal Microstructures

Synthesis of Heterostructured Metallic Films with Precisely Defined Multimodal Microstructures

Self-assembled NiO nano-wires on epitaxial Ni films

Magnetic characterization of (001) and (111) Ni films epitaxially grown on MgO

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