Antiferromagnetically coupled patterned media

Piramanayagam, S. N.; Aung, Kyaw Myo; Deng, Shenghua; Sbiaa, R.

doi:10.1063/1.3075565

Cited by 33 publications

(13 citation statements)

References 19 publications

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“…Switching field distribution (SFD) is an important parameter in magnetic recording. 28 The SFD affects the writing process and hence the magnetic recording performance. Therefore, it is essential to obtain an SFD as narrow as possible.…”

Section: Patterned Recording Mediamentioning

confidence: 99%

Perspectives for 10 Terabits/in<SUP>2</SUP> Magnetic Recording

Chong¹,

Piramanayagam²,

Sbiaa³

2011

J. Nanosci. Nanotech.

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Magnetic recording technology has come a long way, since the introduction of the first hard disk drives (HDD) in 1956. The areal density has grown by a factor of 200 million times and the HDD has stayed as a main candidate for mass storage of information. In order to maintain its lead over other competing technologies, HDD industry continues to invent several technologies. Having introduced perpendicular recording technology in the last 5 years, the industry is looking at introducing bit-patterned media or heat-assisted magnetic recording in the next five years. The researchers--looking at a longer term--are investigating 10 Tbits/in2 as the next major milestone. The issues and probable candidates for 10 Tbits/in2 magnetic recording technology are described from a material perspective.

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Section: Patterned Recording Mediamentioning

confidence: 99%

Perspectives for 10 Terabits/in<SUP>2</SUP> Magnetic Recording

Chong¹,

Piramanayagam²,

Sbiaa³

2011

J. Nanosci. Nanotech.

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“…5 The significance of magnetostatic fields from neighboring bits had been illustrated in micromagnetic simulations which showed that a single magnetic entity is more stable than the entity in a patterned medium. 6 This increase in SFD poses a challenge in the synchronization of writing on the patterned islands for the recording system, as well as an increase in write-in-error due to variations in the writing field needed for each bit. [7][8][9] Exchange coupled recording media is one approach to improve writability and hence write-in errors as well.…”

Section: Introductionmentioning

confidence: 99%

Magnetostatic Interactions in Antiferromagnetically Coupled Patterned Media

Deng

Aung

Piramanayagam

et al. 2011

J. Nanosci. Nanotech.

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In an array of closely spaced magnetic islands as in patterned media, magnetostatic interactions play a major role in widening the switching field distribution and reducing the thermal stability. Patterned antiferromagnetically coupled (AFC) media provide interesting systems for studying the effect of magnetostatic interactions on the reversal of closely spaced AFC bits in an array, as AFC structure helps to reduce the remanent magnetization (M(r)), leading to reduced magnetostatic interactions. Here, we study the magnetic reversal of single domain-patterned AFC CoCrPt:oxide bilayer system with perpendicular magnetic anisotropy, by imaging the remanence state of the bits after the application of a magnetic field with magnetic force microscopy (MFM). The influence of magnetostatic fields from the neighboring bits on the switching field distribution (SFD) for an entity in a patterned media is studied by varying the stabilizing layer thickness of the AFC structure and bit spacing. We observe a distinct increase in stability and coercivity with an increase in stabilizing layer thickness for the 40 nm spaced bits. This demonstrates the effectiveness of the AFC structure for reducing magnetostatic interactions in patterned media, such that high thermal stability can be achieved by the reduced M(r), without writability issues.

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“…[6][7][8][9][10] Recently, antiferromagnetically coupled (AFC) patterned media technology has been proposed to minimize SFD. 9,10 In order to achieve antiferromagnetic coupling at remanence after patterning, it is a prerequisite that the exchange coupling field (H ex ) acting on the thinner layer be greater than its coercivity (H c ). However, there is a challenge with this particular criterion.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5] One of the crucial challenges of BPM is the widening of the switching field distribution (SFD). [5][6][7][8][9] The write-in-error is highly influenced by the SFD, and therefore narrow SFDs within nano-patterned arrays are needed to record onto each individual bit reliably without disturbing the surrounding neighbors. [6][7][8][9][10] Recently, antiferromagnetically coupled (AFC) patterned media technology has been proposed to minimize SFD.…”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7][8][9] The write-in-error is highly influenced by the SFD, and therefore narrow SFDs within nano-patterned arrays are needed to record onto each individual bit reliably without disturbing the surrounding neighbors. [6][7][8][9][10] Recently, antiferromagnetically coupled (AFC) patterned media technology has been proposed to minimize SFD. 9,10 In order to achieve antiferromagnetic coupling at remanence after patterning, it is a prerequisite that the exchange coupling field (H ex ) acting on the thinner layer be greater than its coercivity (H c ).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic properties of antidots in conventional and spin-reoriented antiferromagnetically coupled layers

Ranjbar

Piramanayagam

Sbiaa

et al. 2012

Journal of Applied Physics

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Antiferromagnetically coupled (AFC) patterned media technology is one approach to reduce dipolar interactions and thus minimize the switching field distribution (SFD) in bit-patterned media. Achieving anti-parallel alignment of magnetic moments at remanence requires a large exchange coupling field (H ex ), especially in patterned nanostructures, which exhibit a large enhancement in coercivity after patterning. In our work, we observed a very high H ex of more than 15 kOe in Co thin film antiferromagnetically coupled to (Co/Pd) multilayers with a high perpendicular magnetic anisotropy (PMA). In contrast, an H ex of only 380 Oe was measured in the case of (Co/Pd) multilayers of the type [Co (0.4 nm)/Pd (0.8 nm)] 3 antiferromagnetically coupled with (Co/Pd) multilayers with a high PMA. The effect of H ex on SFD of patterned structures was investigated, and it was found that SFD can be reduced in AFC patterned films with a high H ex .

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Antiferromagnetically coupled patterned media

Cited by 33 publications

References 19 publications

Perspectives for 10 Terabits/in<SUP>2</SUP> Magnetic Recording

Perspectives for 10 Terabits/in<SUP>2</SUP> Magnetic Recording

Magnetostatic Interactions in Antiferromagnetically Coupled Patterned Media

Magnetic properties of antidots in conventional and spin-reoriented antiferromagnetically coupled layers

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