Micromagnetics of long ferromagnetic particles

Seberino, C.; Bertram, H.N.

doi:10.1109/20.617842

Cited by 37 publications

(10 citation statements)

References 8 publications

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“…11,[25][26][27] The pillars are discretized into cu-bic cells whose size is always smaller than the exchange length, which is defined as l ex ϭͱ(A)/M s , where A is the exchange constant and M s the saturation moment. This is 21 nm for pure Ni taking Aϭ10 Ϫ6 erg cm Ϫ1 .…”

Section: Micromagnetic Modelingmentioning

confidence: 99%

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Effect of temperature and cubic anisotropy on the switching field of cylindrical Ni particles

Hwang

Shima

Ross

et al. 2002

Journal of Applied Physics

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The switching fields of nickel cylinders with ϳ100 nm dimensions have been compared to the predictions of a numerical micromagnetic model. The switching field decreases with increasing diameter and decreasing aspect ratio, and there is a good agreement between the measured and calculated values. The samples have a strong ͗111͘ preferred crystal orientation, and the large increase in switching field and switching field distribution with decreasing temperature can be explained by the large increase in magnetocrystalline anisotropy at low temperatures.

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Section: Micromagnetic Modelingmentioning

confidence: 99%

“…Smaller cell sizes give similar results. 11,25 The equilibrium magnetization distribution is calculated for different applied fields. The simulation starts with the magnetizations of all the cells aligned in the direction of a field which is large enough to saturate the particle.…”

Section: Micromagnetic Modelingmentioning

confidence: 99%

Effect of temperature and cubic anisotropy on the switching field of cylindrical Ni particles

Hwang

Shima

Ross

et al. 2002

Journal of Applied Physics

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“…We deduce that the magnetization reversal of a Co nanorod starts by a nucleation at the ends of the nanorod at a critical field followed by a sharp total magnetization reversal. Previous simulations also reported that the magnetization reversal in magnetic cylinders starts from nucleation at the ends of the cylinder, and the nonuniform magnetization at the ends of cylinder reduces the switching field considerably [18][19][20].…”

Section: Microscopic Characterization and Magnetization Reversalmentioning

confidence: 85%

Finite Angular Resolution Mie-Scattering Measurements of Sonoluminescing Bubbles

Hayashi¹

1999

Jpn. J. Appl. Phys.

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The magnetization reversal process of an ordered Co nanorod array is shown using the images obtained from successive in-field magnetic force microscope (MFM) measurements. The magnetization reversal model is discussed according to local and whole magnetization reversal properties measured by the polar magneto-optical Kerr effect (PMOKE) and an alternating gradient magnetometer (AGM), respectively. Additionally, the dipolar field was probed using in-field MFM measurements. By removing the effect of the dipolar field, an intrinsic switching field distribution (SFD) is shown in a map with a hexagonal array. A detailed study of the dipolar field in ordered nanorod arrays with various diameters and pitches was carried out by numerical calculations.(Some figures in this article are in colour only in the electronic version)

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“…In the current system about 1 dB degradation in SNR occurs due to edge effects and side reading. Also, in a real writing process, the medium should probably be thin compared with the exchange-length to ensure an uniform switching of the grain [14]. These competing factors suggest that a valuable emphasis for future work would be the optimization of the medium thickness.…”

Section: Summary Discussion and Future Studymentioning

confidence: 99%

Simulation of the off-track capability of a one terabit per square inch recording system

Zhou

Wilson

et al. 2002

IEEE Trans. Magn.

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We investigated the potential of extending conventional magnetic recording technology to a one terabit per square inch (Tb/in 2 ) density using a simple model, focusing on the off-track capability of a hypothetical perpendicular recording system. Our simulation considered the medium's granular structure, head side reading, and side writing. However, as a first approximation, interactions between grains were neglected. We investigated the characteristics of both an isolated transition and a pseudorandom sequence. The signal-to-noise ratio is very low (around 10 dB) at such a density. Direct bit-by-bit simulation on 80 000 bits of a 1023-bit pseudorandom sequence yielded the bit-error rate (BER). By changing the squeeze position of the side track, a series of "bathtub" curves was calculated and thus, 747 curves at various BER thresholds were investigated. We also studied different detection schemes and the block failure rate after error-correction code.Index Terms-Bit-error rate, block failure rate, off-track capability, perpendicular recording, squeeze, terabit recording.

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Micromagnetics of long ferromagnetic particles

Cited by 37 publications

References 8 publications

Effect of temperature and cubic anisotropy on the switching field of cylindrical Ni particles

Effect of temperature and cubic anisotropy on the switching field of cylindrical Ni particles

Finite Angular Resolution Mie-Scattering Measurements of Sonoluminescing Bubbles

Simulation of the off-track capability of a one terabit per square inch recording system

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