Coercivity of magnetic domain wall motion near the edge of a terrace

Hsieh, Yung Chieh; Mansuripur, Masud

doi:10.1063/1.360611

Cited by 10 publications

(4 citation statements)

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“…We attribute the increased coercivity to increased domain wall pinning due to the presence of a higher defect density in the form of peaks and pits, on the scale of tens and hundreds of nanometers in width and height as seen on the AFM scan in Figure d. These defects can act to pin or trap domain walls due to local changes in anisotropy or film thickness . This is further evidenced by the domain imaging of a 0.8 nm CoFeB layer on the polyimide substrate in Figure b where we observe significant domain wall pinning and a larger number of nucleation sites than Figure a.…”

mentioning

confidence: 64%

Toward Flexible Spintronics: Perpendicularly Magnetized Synthetic Antiferromagnetic Thin Films and Nanowires on Polyimide Substrates

Vemulkar

Mansell

Fernández-Pacheco

et al. 2016

Adv Funct Materials

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The successful fabrication of ultra‐thin films of CoFeB/Pt with strong perpendicular magnetic anisotropy and antiferromagnetic interfacial interlayer coupling on flexible polyimide substrates is demonstrated. Despite an increased surface roughness and defect density on the polyimide substrate, magnetic single layers of CoFeB still show sharp coercive switching. Magnetic Kerr imaging shows that the magnetization reversal is dominated by a greater density of nucleation sites than the identical film grown on Si. These layers maintain their magnetic characteristics down to a radius of curvature of 350 ± µm. Further, antiferromagnetically (AF) Ruderman‐Kittel‐Kasuya‐Yoshida (RKKY) coupled bilayers of CoFeB were fabricated which are robust under bending and the coupling strength is successfully modulated via interlayer engineering. Finally, a perpendicular synthetic antiferromagnetic (SAF) thin film grown on a polyimide substrate is patterned into straight 10 µm long nanowires down to 210 nm in width that displayed the robust switching characteristics of the thin film. These are extremely promising results for the fabrication of robust, flexible, magneto‐electronic, non‐volatile memory, logic, and sensor devices.

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mentioning

confidence: 64%

Toward Flexible Spintronics: Perpendicularly Magnetized Synthetic Antiferromagnetic Thin Films and Nanowires on Polyimide Substrates

Vemulkar

Mansell

Fernández-Pacheco

et al. 2016

Adv Funct Materials

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“…In Co/Pt MLs the anisotropy is strongly related to the Co layer thickness [37]. It is reasonable to assume that the magnetic anisotropy is different in the perimeter region due to the reduced thickness, which may also help to pin the domain walls at this region [38].…”

Section: Resultsmentioning

confidence: 99%

A large-area mesoporous array of magnetic nanostructure with perpendicular anisotropy integrated on Si wafers

Rahman

Shams²,

Lai³

2008

Nanotechnology

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Large-area, over several square centimeters, mesoporous array of magnetic nanostructure with perpendicular anisotropy is prepared by depositing Co/Pt multilayers (MLs) on a mesopore array of anodized alumina (AAO) fabricated on Si wafers. The MLs are mainly deposited on the top of AAO walls and perimeters of the pores; very small amounts of magnetic material reach the bottom due to the high aspect ratio of AAO. Consequently, ordered pores are present in the magnetic MLs. The mean pore diameter of the fabricated mesoporous array is 8.83 nm with a standard deviation of 3.16 nm and density of about 2.1 × 10(11) cm(-2). The Co/Pt MLs deposited on AAO and Si both exhibit strong perpendicular magnetic anisotropy, but the perpendicular coercivity (H(c)) increases by 15 times on AAO compared to that on Si. On the other hand, the magnetic cluster size decreases from 1000 nm (on Si) to 100 nm due to the presence of high-density pores. The dramatic increase in H(c) and the decrease in magnetic cluster size suggest that the pores behave as effective pinning sites. The magnetization-switching characteristics of the fabricated porous structure are different from those of the continuous films or Stoner-Wohlfarth-type (S-W) particles. One of the potential applications of this mesoporous structure may be in the field of high-density magnetic data storage.

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“…Another study sputtered a thin Co/Pt film on an AAO template to produce magnetic anti-dot arrays with a pore size range between 7 and 46 nm (Figure 6c), of which the 30 nm (Figure 6d) anti-dot array exhibited the highest out-of-plane coercive field H c = 1350 Oe and out-of-plane magnetic hysteresis loop squareness ratio S [82]. Continuous films only exhibited a coercive field of 140 Oe with negligible squareness (Figure 6d, green line), while porous films with larger pore sizes displayed sharp reductions in H c (Figure 6d, red line) due to high anisotropy in the vicinity of the pore rim [91]. The enhanced coercivity is attributed to the anti-dot array serving as non-magnetic defects, which effectively results in stronger domain-wall pinning with increasing pore size [92].…”

Section: Functional Reverse Templatementioning

confidence: 99%

Progress in Nanoporous Templates: Beyond Anodic Aluminum Oxide and Towards Functional Complex Materials

Zhou

Nonnenmann

2019

Materials

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Successful synthesis of ordered porous, multi-component complex materials requires a series of coordinated processes, typically including fabrication of a master template, deposition of materials within the pores to form a negative structure, and a third deposition or etching process to create the final, functional template. Translating the utility and the simplicity of the ordered nanoporous geometry of binary oxide templates to those comprising complex functional oxides used in energy, electronic, and biology applications has been met with numerous critical challenges. This review surveys the current state of commonly used complex material nanoporous template synthesis techniques derived from the base anodic aluminum oxide (AAO) geometry.

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Coercivity of magnetic domain wall motion near the edge of a terrace

Cited by 10 publications

References 4 publications

Toward Flexible Spintronics: Perpendicularly Magnetized Synthetic Antiferromagnetic Thin Films and Nanowires on Polyimide Substrates

Toward Flexible Spintronics: Perpendicularly Magnetized Synthetic Antiferromagnetic Thin Films and Nanowires on Polyimide Substrates

A large-area mesoporous array of magnetic nanostructure with perpendicular anisotropy integrated on Si wafers

Progress in Nanoporous Templates: Beyond Anodic Aluminum Oxide and Towards Functional Complex Materials

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