Stacking faults and their effect on magnetocrystalline anisotropy in Co and Co-alloy thin films

Bian, Bo; Yang, Wei; Laughlin, David E.; Lambeth, D.N.

doi:10.1109/20.950869

Cited by 26 publications

(8 citation statements)

References 11 publications

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“…Since the 2 nm thick CoCrTa layer in sample c possesses the same symmetry as the CoCrPt magnetic layer, it may reduce the tendency for the CoCrPt to form stacking faults. In related work, our study on stacking faults in unicrystal Co thin films showed that stacking faults in Co and Co alloy thin films significantly, and negatively, affected the anisotropy [4].…”

Section: Discussionmentioning

confidence: 85%

High coercivity Co-alloy thin films on polymer substrates

et al. 2001

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Films of (10 10) textured CoCrPt have been sputtered on polymer substrates for use as thin film tape media. Underlayers of NiAl combined with various intermediate layers were employed to obtain this orientation without thermal damage to the polymer. It was found that NiAl underlayers sputtered on tape substrates have a (112) growth texture, like they do on glass. Film coercivity varied as a function of intermediate layers used, with the highest value of coercivity (3800 Oe) being obtained with a composite intermediate layer of CrMn\CoCrMn. TEM observation showed that the CoCrMn component of these intermediate layers was hexagonal with a (10 10) texture and low stacking fault density. The CoCrPt layers deposited on these CoCrMn layers had uniform grains with a lower stacking fault density, possibly due to grain-to-grain epitaxial growth of CoCrPt on CoCrMn.

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Section: Discussionmentioning

confidence: 85%

High coercivity Co-alloy thin films on polymer substrates

et al. 2001

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“…Electron diffraction measurements obtained via cryo-TEM (Figure S1c,d) confirm the presence of domains containing stacking faults in SS-LYC. Streaks in an electron diffraction pattern have been widely reported as indications of stacking faults − and provide unquestionable evidence that the LYC layered structure is capable of experiencing these planar defects.…”

Section: Resultsmentioning

confidence: 99%

Stacking Faults Assist Lithium-Ion Conduction in a Halide-Based Superionic Conductor

et al. 2022

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In the pursuit of urgently needed, energy dense solid-state batteries for electric vehicle and portable electronics applications, halide solid electrolytes offer a promising path forward with exceptional compatibility against high-voltage oxide electrodes, tunable ionic conductivities, and facile processing. For this family of compounds, synthesis protocols strongly affect cation site disorder and modulate Li + mobility. In this work, we reveal the presence of a high concentration of stacking faults in the superionic conductor Li 3 YCl 6 and demonstrate a method of controlling its Li + conductivity by tuning the defect concentration with synthesis and heat treatments at select temperatures. Leveraging complementary insights from variable temperature synchrotron X-ray diffraction, neutron diffraction, cryogenic transmission electron microscopy, solid-state nuclear magnetic resonance, density functional theory, and electrochemical impedance spectroscopy, we identify the nature of planar defects and the role of nonstoichiometry in lowering Li + migration barriers and increasing Li site connectivity in mechanochemically synthesized Li 3 YCl 6 . We harness paramagnetic relaxation enhancement to enable 89 Y solid-state NMR and directly contrast the Y cation site disorder resulting from different preparation methods, demonstrating a potent tool for other researchers studying Y-containing compositions. With heat treatments at temperatures as low as 333 K (60 °C), we decrease the concentration of planar defects, demonstrating a simple method for tuning the Li + conductivity. Findings from this work are expected to be generalizable to other halide solid electrolyte candidates and provide an improved understanding of defect-enabled Li + conduction in this class of Li-ion conductors.

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“…Multilayered samples exhibit a rather faulty crystallographic structure, as compared with single Co nanowires [24]. However, this was expected from the weaker value of the crystal field since the magnetocrystalline anisotropy decreases with an increased proportion of stacking faults [25].…”

Section: Resultsmentioning

confidence: 96%

Magnetic Field Annealing Effects on Magnetic Properties of Electrodeposited Co/Cu Multilayered Nanowires

et al. 2014

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Co/Cu nanowires were fabricated by electrodeposition using anodic alumina templates, with 100 nm diameter nanopores. The thickness of Co and Cu layer was about 45 and 5 nm, respectively. The magnetic properties of multilayered nanowires have been studied before and after simple and magnetic field (MF) annealing. For simple annealing, an increase in coercivity and squareness (SQ) along easy axis of magnetization has been observed. Magnetic field annealing has been done under MF of 1 T. For comparison, the MF annealing effect on magnetic properties has been studied using fast and slow temperature variations. The corresponding change in saturation magnetization, coercivity, remanent SQ, and the shape of hysteresis loops has been investigated. The coercivity Hc decreases in case of MF annealing with fast temperature variation, whereas it increases in case of MF annealing with slow temperature variation, as compared with as deposited. The enhanced magnetic anisotropy has been observed by slow MF annealing (SMFA), whereas magnetic anisotropy attenuated a little by fast MF annealing. Annealing without MF has also shown the enhanced magnetic anisotropy. SMFA and annealing without MF is likely to improve the interface of Co/Cu. Index Terms-Co/Cu multilayered nanowires, magnetic anisotropy, magnetic field (MF) annealing.

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Stacking faults and their effect on magnetocrystalline anisotropy in Co and Co-alloy thin films

Cited by 26 publications

References 11 publications

High coercivity Co-alloy thin films on polymer substrates

High coercivity Co-alloy thin films on polymer substrates

Stacking Faults Assist Lithium-Ion Conduction in a Halide-Based Superionic Conductor

Magnetic Field Annealing Effects on Magnetic Properties of Electrodeposited Co/Cu Multilayered Nanowires

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