MFM analysis of magnetization process in CoPt dot-array

Takahoshi, H.; Saito, Hitoshi; Ishio, S.

doi:10.1016/j.jmmm.2003.12.1037

Cited by 11 publications

(4 citation statements)

References 9 publications

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“…The shifts of the tips under the magnetization of the sample are represented on MFM images by dark and bright regions, e.g. the dark regions demonstrate large negative shifts (repulsion) and the bright regions demonstrate large positive shifts (attraction) [18]. The magnetic dispersity of the Fe oxide layer was more homogenous than that of the Au-Fe oxide layer, indicating that the size distribution of Fe oxide nanoparticles is more homogenous.…”

Section: Magnetic Analysis By Mfmmentioning

confidence: 99%

Application of citrate-stabilized gold-coated ferric oxide composite nanoparticles for biological separations

Pham

Cao

Sim

2008

Journal of Magnetism and Magnetic Materials

121

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Section: Magnetic Analysis By Mfmmentioning

confidence: 99%

Application of citrate-stabilized gold-coated ferric oxide composite nanoparticles for biological separations

Pham

Cao

Sim

2008

Journal of Magnetism and Magnetic Materials

121

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“…[1][2][3][4][5][6][7] In this connection considerable efforts have been applied to the investigation of coercivity, thermal stability, and recording properties of patterned systems. [8][9][10][11][12][13][14][15][16] However most studies focused on the investigation of the array's averaged properties and inhomogeneous dot's switching in an external homogeneous magnetic field. In this article we discuss the peculiarities of the magnetization reversal of individual dots in a nonhomogeneous magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Magnetic force microscope tip-induced remagnetization of CoPt nanodisks with perpendicular anisotropy

Миронов

Gribkov

Вдовичев

et al. 2009

Journal of Applied Physics

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We report on the results of a magnetic force microscopy investigation of remagnetization processes in arrays of CoPt nanodisks with diameters of 35 and 200 nm and a thickness of 9.8 nm fabricated by e-beam lithography and ion etching. The controllable magnetization reversal of individual CoPt nanodisks by the magnetic force microscope ͑MFM͒ tip-induced magnetic field was demonstrated. We observed experimentally two essentially different processes of tip-induced remagnetization. Magnetization reversal of 200 nm disks was observed when the probe moved across the particle while in case of 35 nm nanodisks one-touch remagnetization was realized. Micromagnetic modeling based on the Landau-Lifshitz-Gilbert ͑LLG͒ equation demonstrated that the tip-induced magnetization reversal occurs through the essentially inhomogeneous states. Computer simulations confirmed that in case of 200 nm disks the mechanism of embryo nucleation with reversed magnetization and further dynamic propagation following the probe moving across the particle was realized. On the other hand one-touch remagnetization of 35 nm disks occurs through the inhomogeneous vortexlike state. Micromagnetic LLG simulations showed that magnetization reversal in an inhomogeneous MFM probe field has a lower energy barrier in comparison with the mechanism of coherent rotation, which takes place in a homogeneous external magnetic field.

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“…For the fabrication of bit patterned media, lithographic patterning, ion irradiation, and various chemical methods have been reported so far. [14][15][16][17][18][19][20] In the lithographic patterning and the self-organizing methods, removing materials between dots or assembling particles leads to not only variations in the height of the surface, which causes tribology problems in the near-contact recording scheme but also damages dots which leads to variations in the reversal field.…”

Section: Introductionmentioning

confidence: 99%

Study of ferro-antiferromagnetic transition in [001]-oriented L1 FePt1−xRhx film

Hasegawa

Miyahara

et al. 2009

Journal of Applied Physics

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Magnetic properties of [001]-oriented L10 FePt1−xRhx films (tFePtRh=6.12 nm) with Rh composition (x) of 0≤x≤0.40 were studied, and the magnetic phase in a composition-temperature plane was investigated. At room temperature, the films with 0≤x≤0.32 were in a ferromagnetic (FM) phase with a coercivity of several kilo-oersteds, and the films with 0.34≤x≤0.40 were in an antiferromagnetic (AF) phase. At x=0.32, which is close to the critical composition of the FM-AF transition at room temperature, the uniaxial magnetocrystalline anisotropy (Ku) was about 1.7×107 erg/cm3. A bit patterning process using the discontinuous FM-AF transition was studied. First, microfabricated FePt square films (1.7 nm thick) were prepared on the AF FePt0.64Rh0.36 film (6.7 nm thick). Second, those square films and the FePt0.64Rh0.36 film were mixed by annealing. The Fe and Pt atoms were thermally diffused into the FePt0.64Rh0.36 film locally, and the composition of the diffused areas changed to FM FePt0.72Rh0.28. A magnetic force microscopy study suggested that only the diffused areas changed from AF to FM phase. A minimum FM dot size of 300×300 nm2 was realized, and the FM dots were multidomain structures.

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MFM analysis of magnetization process in CoPt dot-array

Cited by 11 publications

References 9 publications

Application of citrate-stabilized gold-coated ferric oxide composite nanoparticles for biological separations

Application of citrate-stabilized gold-coated ferric oxide composite nanoparticles for biological separations

Magnetic force microscope tip-induced remagnetization of CoPt nanodisks with perpendicular anisotropy

Study of ferro-antiferromagnetic transition in [001]-oriented L1 FePt1−xRhx film

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