New Magnetic Recording Media

Sellmyer, David J.; Zeng, Hao; Sun, Shouheng; Liu, Y.

doi:10.1007/1-4020-7984-2_37

Cited by 8 publications

(9 citation statements)

References 84 publications

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“…The measured isothermal magnetization curve and the hysteresis loop of the prepared nanocrystalline SmCo 3 compound are shown in figure 4. A very high coercivity of 33 kOe has been achieved in the nanocrystalline SmCo 3 compound, which is larger than the coercivity of the commercial SmCo 5 -type permanent magnets [18].…”

Section: Magnetic Properties Of Nanocrystalline Smco 3 Compoundmentioning

confidence: 84%

“…The nanocrystalline RE/TM alloys have attracted increasing interest in the field of magnetic materials owing to their enhanced magnetic performance compared to the coarsegrained alloys [10,11]. It was reported that the nanostructured RECo 3 -based magnets of SmCo 3 :Co x and SmCo 3 :Pr x systems, which were synthesized by sputtering, exhibited a high coercivity after the multi-step heat treatment [12]. This result shows that the nanostructured RECo 3 -based alloys can be developed as a class of promising permanent magnets.…”

Section: Introductionmentioning

confidence: 99%

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Crystal structure and magnetic properties of ultrafine nanocrystalline SmCo₃compound

Song

Zhang

2010

Nanotechnology

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The single-phase ultrafine nanocrystalline SmCo(3) compound with a high coercivity of 33 kOe and a Curie temperature of 925 K was prepared using a simple and efficient method, which took advantages of the concurrent processes of nanocrystallization and densification during spark plasma sintering. The crystal structure of the nanocrystalline SmCo(3) compound was constructed. As compared with the conventional microcrystalline SmCo(3) compound, a large axial ratio c/a = 4.920 and an expansion of the unit cell volume of 2.97% were obtained in the lattice structure of the nanocrystalline SmCo(3). The relationship between the magnetic properties and the nanocrystalline structure was analyzed. A specific magnetic transition from the weak ferromagnetic to the strong ferromagnetic state was discovered in the nanocrystalline SmCo(3) compound, which was considered to be related to the large anisotropic strain in the crystal lattice.

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Section: Magnetic Properties Of Nanocrystalline Smco 3 Compoundmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Crystal structure and magnetic properties of ultrafine nanocrystalline SmCo₃compound

Song

Zhang

2010

Nanotechnology

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“…They are of fundamental scientific interest, e.g. as smart and intelligent materials for magnetic storage, recording, sensing or actuating ( 1 ). There is an increasing importance of technical applications due to ongoing omnipresent miniaturization and integration in MEMS/NEMS systems.…”

Section: Introductionmentioning

confidence: 99%

Fe-Based Magnetic Alloy Electrodeposition for Thin Films and Template Based Nanostructures

Haehnel

Konczak

et al. 2016

ECS Trans.

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The electrochemical fabrication of the Fe-based soft magnetic CoFe alloy and the shape memory active Fe-Pd alloy is reported. We examine the influence of electrolyte composition and deposition regime or post treatment on morphology, composition and structural development of the deposits. Up to 10 µm thick CoFe films with 55 at.% Fe were achieved from simple and additive adjusted electrolytes by potentiostatic or alternating potential deposition regime. Micropatterned deposits of smooth surface morphology and high saturation magnetization applicable as magnetic field gradient generator can be prepared best by the combination of SDS additive and alternating potential regime. The Fe-Pd alloy has been deposited and heat treated to achieve a composition with 30 at.% Pd and to adjust the crystal structure. For thin films and nanowires the transition from bcc to fcc phase is accomplished. This represents a good starting point towards shape memory active materials and their further physical characterization.

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“…Magnetic relaxation 1) is one of the features of a magnetic particle assembly in application. For single-domain magnetic particles, magnetic relaxation is related to the timedependent magnetization reversal under thermal activation.…”

Section: Introductionmentioning

confidence: 99%

Relaxation Phenomena of a Magnetic Nanoparticle Assembly with Randomly Oriented Anisotropy

Fang¹,

WenXiao

He³

et al. 2011

Jpn. J. Appl. Phys.

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The effects of a randomly oriented anisotropy on relaxation phenomena including the memory effect of a noninteracting magnetic nanoparticle assembly, are numerically studied with a localized partition function and a master equation, leading to the following results. During the zero-field-cooled (ZFC) process, the energy barrier histogram changes with temperature, while during the field-cooled (FC) process it remains stable. In the relaxation process after ZFC initialization, the effective energy barrier distribution, which is derived from the Tln (t/τ0) (T temperature, t time, and τ0 characteristic time constant) scaling curve, only reflects the low-energy region of the energy barrier histogram. The memory effect with temporary cooling during time evolution occurs in the studied assembly even without volume distribution and particle interaction involved.

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New Magnetic Recording Media

Cited by 8 publications

References 84 publications

Crystal structure and magnetic properties of ultrafine nanocrystalline SmCo₃compound

Crystal structure and magnetic properties of ultrafine nanocrystalline SmCo₃compound

Fe-Based Magnetic Alloy Electrodeposition for Thin Films and Template Based Nanostructures

Relaxation Phenomena of a Magnetic Nanoparticle Assembly with Randomly Oriented Anisotropy

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New Magnetic Recording Media

Cited by 8 publications

References 84 publications

Crystal structure and magnetic properties of ultrafine nanocrystalline SmCo3compound

Crystal structure and magnetic properties of ultrafine nanocrystalline SmCo3compound

Fe-Based Magnetic Alloy Electrodeposition for Thin Films and Template Based Nanostructures

Relaxation Phenomena of a Magnetic Nanoparticle Assembly with Randomly Oriented Anisotropy

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Product

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Crystal structure and magnetic properties of ultrafine nanocrystalline SmCo₃compound

Crystal structure and magnetic properties of ultrafine nanocrystalline SmCo₃compound