FePt nanodot arrays with perpendicular easy axis, large coercivity, and extremely high density

Kim, Chaehyun; Loedding, Thomas; Jang, Seongjin; Zeng, Hao; Li, Zhen; Sui, Yucheng; Sellmyer, David J.

doi:10.1063/1.2802038

Cited by 72 publications

(48 citation statements)

References 20 publications

(26 reference statements)

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“…17 For BPM application, the small separation between each bit (<5 nm for 1T bis/in. 2 recording density) leads to a strong magnetic stray field acting on the neighboring bits. This undesirable reversal of magnetization by this strong stray field represents a serious challenge for BPM with PMA.…”

Section: Introductionmentioning

confidence: 99%

“…Enormous efforts are devoted to the development of magnetic materials with perpendicular magnetic anisotropy (PMA) for bit-patterned media (BPM) [1][2][3][4][5][6][7] and magnetic random access memory (MRAM). [8][9][10][11][12][13][14][15] In fact, materials with PMA have higher magnetic anisotropy energy compared to their counterparts with in-plane anisotropy.…”

Section: Introductionmentioning

confidence: 99%

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Temperature effect on exchange coupling and magnetization reversal in antiferromagnetically coupled (Co/Pd) multilayers

Sbiaa

Al‐Omari

Kharel

et al. 2015

Journal of Applied Physics

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Sbiaa, R.; Al-Omari, I. A.; Kharel, Parashu R.; Ranjbar, M.; Sellmyer, David J.; Akerman, J.; and Piramanayagam, S. N., "Temperature effect on exchange coupling and magnetization reversal in antiferromagnetically coupled (Co/Pd) multilayers" (2015). Magnetization reversal of antiferromagnetically coupled (AFC) soft and hard (Co/Pd) multilayers was studied as a function of temperature. While the hard [Co(0.3 nm)/Pd(0.8 nm)] Â10 was kept unchanged, the softness of the [Co(t)/Pd(0.8 nm)] Â3 was controlled by varying the thickness t of the Co sublayer. Clear two-step hysteresis loops were observed for all the investigated multilayers with t ranging between 0.4 and 1 nm. The spin reorientation of the soft layer magnetization from in-plane direction to out-of-plane direction was investigated from 50 to 300 K. The antiferromagnetic field H AFC measured from the shift of the minor hysteresis loop reveals a good agreement to the quantum-well model. From the out-of-plane hysteresis loop of the uncoupled soft layer, its magnetization shows an in-plane orientation for t ! 0.6 nm. The strong H AFC helps to induce an out-of plane orientation of the soft layer with a linear decrease of its coercivity with temperature. These investigated structures show the possibility to reduce the unwanted stray field and improving the out-of-plane anisotropy even for relatively thicker soft layer. V C 2015 AIP Publishing LLC.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Temperature effect on exchange coupling and magnetization reversal in antiferromagnetically coupled (Co/Pd) multilayers

Sbiaa

Al‐Omari

Kharel

et al. 2015

Journal of Applied Physics

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“…Recently, porous anodized aluminum (PAA) templates have been used to fabricate large areas of metal and oxide nanodot arrays because of their low production cost, pore size controllability, and ease of fabrication, which is called the bottom-up method [11][12][13][14][15]. The PAA-based method is a direct approach for growing epitaxial nanodot arrays, in which the atoms passing through the pore directly arrive at the substrate.…”

Section: Introductionmentioning

confidence: 99%

Morphology and magnetic properties of Fe3O4 nanodot arrays using template-assisted epitaxial growth

Guan¹,

Chen²,

Quan³

et al. 2016

Nano Online

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Arrays of epitaxial Fe 3 O 4 nanodots were prepared using laser molecular beam epitaxy (LMBE), with the aid of ultrathin porous anodized aluminum templates. An Fe 3 O 4 film was also prepared using LMBE. Atomic force microscopy and scanning electron microscopy images showed that the Fe 3 O 4 nanodots existed over large areas of well-ordered hexagonal arrays with dot diameters (D) of 40, 70, and 140 nm; height of approximately 20 nm; and inter-dot distances (D int ) of 67, 110, and 160 nm. The calculated nanodot density was as high as 0.18 Tb in.−2 when D = 40 nm. X-ray diffraction patterns indicated that the as-grown Fe 3 O 4 nanodots and the film had good textures of (004) orientation. Both the film and the nanodot arrays exhibited magnetic anisotropy; the anisotropy of the nanoarray weakened with decreasing dot size. The Verwey transition temperature of the film and nanodot arrays with D ≥ 70 nm was observed at around 120 K, similar to that of the Fe 3 O 4 bulk; however, no clear transition was observed from the small nanodot array with D = 40 nm. Results showed that magnetic properties could be tailored through the morphology of nanodots. Therefore, Fe 3 O 4 nanodot arrays may be applied in high-density magnetic storage and spintronic devices.

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“…For perpendicular recording application, the orientation of the L10 FePt film should have the c-axis perpendicular to the film plane. Many efforts, such as the addition of TiN [4], Ag [5], CrRu [6], CrMo [7], and using RuAl underlayer [8] and nonepitaxial growth [9][10][11][12][13] have been devoted to promoting the L10 FePt (001) texture as a perpendicular magnetic recording media.…”

Section: Introductionmentioning

confidence: 99%

Effects of deposition temperature and in-situ annealing time on structure and magnetic properties of (001) orientation FePt films

George

et al. 2013

Journal of Magnetism and Magnetic Materials

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"Effects of deposition temperature and insitu annealing time on structure and magnetic properties of (001) orientation FePt films" (2012 Effects of deposition temperature and in-situ annealing time on structure and magnetic properties of (001) AbstractFePt films were prepared on (100) oriented single crystal MgO substrates at high temperature ranging from 620 until 800°C and in-situ annealed for different times ranging from 0 to 60 min to obtain ordered FePt films. The structural analysis indicates that FePt films grow epitaxially on MgO (100) substrates. Both increasing deposition temperature and in-situ annealing time enhance the (001) texture and ordering of FePt films. The magnetic analysis shows that these L10 FePt films have perpendicular anisotropy and the easy magnetization c-axis is perpendicular to the film plane. Magnetization reversal is controlled by a rotational mechanism. The hard magnetic properties of the films are improved with increasing deposition temperature or in-situ annealing time.

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FePt nanodot arrays with perpendicular easy axis, large coercivity, and extremely high density

Cited by 72 publications

References 20 publications

Temperature effect on exchange coupling and magnetization reversal in antiferromagnetically coupled (Co/Pd) multilayers

Temperature effect on exchange coupling and magnetization reversal in antiferromagnetically coupled (Co/Pd) multilayers

Morphology and magnetic properties of Fe3O4 nanodot arrays using template-assisted epitaxial growth

Effects of deposition temperature and in-situ annealing time on structure and magnetic properties of (001) orientation FePt films

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