Effect of sputtering pressure on stacking fault density and perpendicular magnetic anisotropy of CoPt alloys

Park, Kyung-Woong; Oh, Yonghui; Kim, Dae-Hoon; Kim, Jai-Young; Park, Byong‐Guk

doi:10.1088/0022-3727/49/34/345002

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…16 Oe), velocities that differ in more than two orders of magnitude are found (4.1 × 10 −3 m s −1 for 3 × 10 −6 Torr and 2.8 × 10 −5 m s −1 for 1 × 10 −5 Torr). This indicates that the DW velocity in the creep regime is not only influenced by the Ar pressure during deposition, as previously pointed out by other authors [11,20,32], but also by the base pressure prior to deposition. This parameter of the growth process defines the degree of purity of the gas inside the chamber which impacts on the quality of the obtained materials.…”

Section: Domain Wall Velocity and Coercive Fieldsupporting

confidence: 82%

Impact of growth conditions on the domain nucleation and domain wall propagation in Pt/Co/Pt stacks

Quinteros¹,

Burgos²,

Albornoz³

et al. 2020

J. Phys. D: Appl. Phys.

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Understanding the effect of fabrication conditions on domain wall (DW) motion in thin films with perpendicular magnetization is a mandatory issue in order to tune their properties aiming to design spintronics devices based on such phenomenon. In this context, the present work intends to show how different growth conditions may affect DW motion in the prototypical system Pt/Co/Pt. The trilayers were deposited by dc sputtering, and the parameters varied in this study were the Co thickness, the substrate roughness and the base pressure in the deposition chamber. Magneto-optical Kerr effect-based magnetometry and microscopy combined with x-ray reflectometry, atomic force microscopy and transmission electron microscopy were adopted as experimental techniques. This permitted us to elucidate the impact on the hysteresis loops and on the DW dynamics, produced by different growth conditions. As other authors, we found that Co thickness is strongly determinant for both the coercive field and the DW velocity. On the contrary, the topographic roughness of the substrate and the base pressure of the deposition chamber evidence a selective impact on the nucleation of magnetic domains and on DW propagation, respectively, providing a tool to tune these properties.

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Section: Domain Wall Velocity and Coercive Fieldsupporting

confidence: 82%

Impact of growth conditions on the domain nucleation and domain wall propagation in Pt/Co/Pt stacks

Quinteros¹,

Burgos²,

Albornoz³

et al. 2020

J. Phys. D: Appl. Phys.

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show abstract

“…However, a cleaner environment prior to sample deposition leads to noticeably higher DW velocity. This indicates that not only Ar pressure during deposition is relevant to determine the properties of the obtained material 5,12,25 , but also the base pressure prior to deposition, since it defines the degree of gas purity within the chamber and may strongly affect also the purity of the obtained materials.…”

Section: Discussionmentioning

confidence: 99%

Impact of growth conditions on the domain nucleation and domain wall propagation in Pt/Co/Pt stacks

Quinteros,

Burgos,

Albornoz

et al. 2020

Preprint

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Understanding and controlling the fabrication conditions of stacks with perpendicular magnetic anisotropy is a mandatory issue in order to achieve a memory device based on such principle. In that sense, the present work intends to demonstrate how the structural differences obtained by systematically varying the growth conditions may affect domain wall motion. Dealing with one prototypical system, such as Pt/Co/Pt, we have found that the magnetic properties, in particular the domain wall velocity, exhibit differences depending on substrate quality, magnetic layer thickness, and deposition atmosphere. Magneto-optical Kerr effect-based magnetometry and microscopy combined with X-ray reflectometry, atomic force microscopy and transmission electron microscopy were adopted as experimental techniques in order to elucidate the effect of growth conditions on domain wall dynamics.

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Incommensurate superlattice modulation surviving down to an atomic scale in sputter-deposited Co/Pt(111) epitaxial multilayered films

Song,

Scheike,

et al. 2024

APL Materials

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We report the structural feature of sputter-deposited epitaxial [Co (0.2 nm)/Pt (0.2–1.0 nm)] multilayered films prepared with various periodic structural designs consisting of non-integer numbers of Co and Pt monoatomic layers on an atomically flat Ru(0001). Sharp superlattice modulation peaks and their systematic changes with the Pt thicknesses were observed in the x-ray diffraction (XRD) spectrum. The formation of periodic structures shows that layer-by-layer like growth occurs and the resulting incommensurate superlattice modulation survives down to an atomic scale even in the sputter-deposited Co/Pt multilayers. Magnetic properties were also investigated for the Co/Pt multilayers. Interestingly, the maximum perpendicular magnetic anisotropy Ku of 3 × 106 erg/cm3 was obtained for the [Co (0.2 nm)/Pt (0.3 nm)] multilayer exhibiting incommensurate superlattice modulation peaks, while the [Co (0.2 nm)/Pt (0.2 nm)] multilayer with a L11-like XRD peak showed a smaller Ku. A cross-sectional high-angle annular dark-field scanning transmission electron microscopy analysis revealed that a partially L11-ordered CoPt structure is formed in the [Co 0.2 nm/Pt 0.2 nm] multilayer, interpreting the observed Ku. This study gives a new insight into the structural feature of sputter-deposited Co/Pt multilayers useful for a wide range of spintronic devices, such as magnetic tunnel junctions.

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Effect of sputtering pressure on stacking fault density and perpendicular magnetic anisotropy of CoPt alloys

Cited by 3 publications

References 19 publications

Impact of growth conditions on the domain nucleation and domain wall propagation in Pt/Co/Pt stacks

Impact of growth conditions on the domain nucleation and domain wall propagation in Pt/Co/Pt stacks

Impact of growth conditions on the domain nucleation and domain wall propagation in Pt/Co/Pt stacks

Incommensurate superlattice modulation surviving down to an atomic scale in sputter-deposited Co/Pt(111) epitaxial multilayered films

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