Tailoring the growth of L1<sub>0</sub>‐FePt for spintronics applications

Tahmasebi, T.; Piramanayagam, S. N.; Sbiaa, R.; Tan, Hwee-Pink; Law, Randall; Lua, S. Y. H.; Chong, Tow Chong

doi:10.1002/pssr.201105379

Cited by 9 publications

(3 citation statements)

References 15 publications

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“…Nanosized iron platinum represents a promising material for such applications − due to its high saturation magnetization and coercivity ( H c ), good chemical stability, as well as large uniaxial magnetocrystalline anisotropy. − Below a critical diameter, iron platinum nanoparticles possess a single-domain state with disordered face-centered cubic (fcc) structure and show superparamagnetic behavior when passing the superparamagnetic limit. Through thermal treatment above 500 °C, a rearrangement of the atoms in the unit cell leads to ordered phases of iron platinum with a stoichiometry strongly dependent on the ratio of Fe and Pt atoms present in the synthesized particles.…”

Section: Introductionmentioning

confidence: 99%

Exchange Bias in FePt–FePt₃ Thin Films by Controlled Phase Transition of Blended Nanoparticle Building Blocks

et al. 2020

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Nanostructured composite thin films showing magnetic exchange coupling at the material interface have attracted great interest for the development of electronic components such as spin-valves. Besides the commonly performed fabrication of multilayer systems, the utilization of nanoparticle building blocks holds great potential for thin films with tailored magnetic properties and allows the facile but controlled combination of materials with complementary magnetic characteristics. In this work, we present the use of prefabricated highly crystalline iron platinum (fcc-FePt) and iron oxide (Fe x O y ) nanoparticles for the preparation of nanocomposite thin films with varying compositions by wet processing from mixed dispersions. The resulting multiphase coatings showed high homogeneity, low surface roughness, and superparamagnetic behavior. By the variation of the amount of incorporated iron oxide, a precise adjustment of the magnetization at high field strength could be achieved. Furthermore, calcination under inert gas atmosphere resulted in a controlled phase transition of the magnetic phases and thus, in purely metallic coatings composed of ferromagnetic fct-FePt and antiferromagnetic fcc-FePt 3 , a decrease in surface roughness as well as high magnetic coercivity at room temperature. Field-cooling below the Neél temperature of fcc-FePt 3 led to an exchange bias effect with a strong increase in coercivity and the characteristic hysteresis shift. In comparison to the literature, our nanocomposite thin films showed fully ordered phases without the occurrence of phase impurities, a distinctly higher coercivity, and an exchange bias shift of 38.7 mT.

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Section: Introductionmentioning

confidence: 99%

Exchange Bias in FePt–FePt₃ Thin Films by Controlled Phase Transition of Blended Nanoparticle Building Blocks

et al. 2020

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“…FePt thin films are studied since several years for applications in magnetic recording and spintronics . A recently proposed magnetic memory design makes use of spin–orbit torques for reversing the magnetization of ultrathin ferromagnetic films and FePt has been suggested as a candidate ferromagnetic material .…”

Section: Introductionmentioning

confidence: 99%

Magnetic anisotropy axis reorientation at ultrathin FePt films

Kaidatzis

Psycharis

Γιαννόπουλος

et al. 2017

Physica Rapid Research Ltrs

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Ultrathin FePt films (thickness between 1 nm and 5 nm) were studied for non‐volatile memories applications. The films were magnetron sputtered on monocrystalline MgO⟨001⟩ substrates at 500 °C. The films are polycrystalline, except the 1 nm thick film which is not continuous. It is shown that films with thickness higher than 2.7 nm have L10 structure and perpendicular magnetic anisotropy, while a transition to in‐plane anisotropy occurs for thinner films. The out‐of‐plane coercivity drops from 16 kOe at the thicker film to 0.5 kOe at the thinner one.

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“…L1 0 -based magnetic materials are difficult to be fabricated, as high deposition temperature is needed in order to transform facecentered-cubic (fcc) phase to face-centered-tetragonal (fct) phase for achieving the PMA. 3,4 However, multilayers with PMA have been intensively investigated as they can be prepared at room temperature.…”

Section: Introductionmentioning

confidence: 99%

CoFeB spin polarizer layer composition effect on magnetization and magneto-transport properties of Co/Pd-based multilayers in pseudo-spin valve structures

Tahmasebi

Piramanayagam

Sbiaa

et al. 2013

Journal of Applied Physics

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In this work, we used Co x Fe 80-x B 20 (x= 60, 40, 20) as spin-polarizing layers (SPL) in order to investigate the composition of the CoFeB-SPL on the magnetoresistance (MR) in Co/Pd multilayers-based pseudo-spin-valves (PSV) with perpendicular magnetic anisotropy (PMA). In both soft layer (SL) and hard layer (HL), the PMA was achieved by tuning the interface anisotropy and bulk anisotropy between SPL and Co/Pd multilayers. For all the films, giant magnetoresistance (GMR) was found to decrease with SPL thickness in the as-deposited case, irrespective of the CoFeB atomic composition and M s. However, interesting behavior is observed when the films were annealed. Although GMR degradation is expected after annealing, a peak of GMR was observed after post annealing the samples at 250 ºC. This peak is stronger for the samples with thicker SPLs than those with thinner SPLs. Nonetheless, further increase in annealing temperature causes a reduction in GMR which is found to be larger in Co rich atomic composition samples with a lower M s. In the case of thicker CoFeB SPL (15 Å), the magnetization of overall composite (Co/Pd)/CoFeB soft layer appears to be canted from out of plane direction. Among the three compositions investigated, Co 60 Fe 20 B 20 polarizer shows a stronger PMA due to its lower M s , leading to the weaker demagnetization. In addition, this study also indicates that the crystallographic texture of Co/Pd multilayers plays a role in the MR.

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Tailoring the growth of L1₀‐FePt for spintronics applications

Cited by 9 publications

References 15 publications

Exchange Bias in FePt–FePt₃ Thin Films by Controlled Phase Transition of Blended Nanoparticle Building Blocks

Exchange Bias in FePt–FePt₃ Thin Films by Controlled Phase Transition of Blended Nanoparticle Building Blocks

Magnetic anisotropy axis reorientation at ultrathin FePt films

CoFeB spin polarizer layer composition effect on magnetization and magneto-transport properties of Co/Pd-based multilayers in pseudo-spin valve structures

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Tailoring the growth of L10‐FePt for spintronics applications

Cited by 9 publications

References 15 publications

Exchange Bias in FePt–FePt3 Thin Films by Controlled Phase Transition of Blended Nanoparticle Building Blocks

Exchange Bias in FePt–FePt3 Thin Films by Controlled Phase Transition of Blended Nanoparticle Building Blocks

Magnetic anisotropy axis reorientation at ultrathin FePt films

CoFeB spin polarizer layer composition effect on magnetization and magneto-transport properties of Co/Pd-based multilayers in pseudo-spin valve structures

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Tailoring the growth of L1₀‐FePt for spintronics applications

Exchange Bias in FePt–FePt₃ Thin Films by Controlled Phase Transition of Blended Nanoparticle Building Blocks

Exchange Bias in FePt–FePt₃ Thin Films by Controlled Phase Transition of Blended Nanoparticle Building Blocks