High Temperature Magnetic Properties of Indirect Exchange Spring FePt/M(Cu,C)/Fe Trilayer Thin Films

Gayen, Anabil; Biswas, Barnali; Singh, Akhilesh Kumar; Saravanan, P.; Perumal, A.

doi:10.1155/2013/718365

Cited by 3 publications

(1 citation statement)

References 53 publications

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“…Let us consider the presence of IEC between the two FM layers, viz. Ni 80 Fe 20 and Co. Possible evidence of its presence is the variation of saturation magnetization with interlayer thickness [54][55][56]. Since CoO is an antiferromagnet that has no net magnetization in this system and the thicknesses of both FM layers are same for all three trilayers, a variation in FM volume normalized (excluding the intermixed ferrite region in the volume calculation) saturation magnetisation (M FM nor ) is not expected if there is no IEC.…”

Section: Magnetic Properties: Interlayer Exchange Couplingmentioning

confidence: 97%

Interface mixing and its impact on exchange coupling in exchange biased systems

Manna

Skoropata

Ting

et al. 2016

J. Phys.: Condens. Matter

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Exchange bias and interlayer exchange coupling are interface driven phenomena. Since an ideal interface is very challenging to achieve, a clear understanding of the chemical and magnetic natures of interfaces is pivotal to identify their influence on the magnetism. We have chosen NiFe/CoO(t )/Co trilayers as a model system, and identified non-stoichiometric Ni-ferrite and Co-ferrite at the surface and interface, respectively. These ferrites, being ferrimagnets typically, should influence the exchange coupling. However, in our trilayers the interface ferrites were found not to be ferro- or ferri-magnetic; thus having no observable influence on the exchange coupling. Our analysis also revealed that (i) interlayer exchange coupling was present between NiFe and Co even though the interlayer thickness was significantly larger than expected for this phenomenon to happen, and (ii) the majority of the CoO layer (except some portion near the interface) did not contribute to the observed exchange bias. We also identified that the interlayer exchange coupling and the exchange bias properties were not interdependent.

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Section: Magnetic Properties: Interlayer Exchange Couplingmentioning

confidence: 97%

Interface mixing and its impact on exchange coupling in exchange biased systems

Manna

Skoropata

Ting

et al. 2016

J. Phys.: Condens. Matter

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Exchange-Coupled Composite Media

Casoli¹,

Nasi²,

Albertini³

et al. 2016

Ultra-High-Density Magnetic Recording

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FePt-C nanogranular films are coming close to the actual application as recording media for the next generation high density recording system, heat assisted magnetic recording (HAMR). To optimize the L10-FePt nanogranular structure suitable for high areal density recording, various combination of segregants and seed layer materials have been explored. In this chapter, we review recent investigations aiming at achieving the ideal nanogranular structure for HAMR media.* Many investigations carried out in industry are kept confidential. It is beyond the authors' knowledge to make comprehensive review including the efforts carried out in industrial laboratories. Hence, the review is based on published literatures only.

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Characterization of Nd(Tb)–Fe–B-based exchange-spring nanocomposite magnets

Karmaker

Rahman

Dan

et al. 2019

Emerging Materials Research

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The authors attempt to optimize for performance the composition of R 2Fe14B/Fe3B-based hard nanocomposite alloys with R = neodymium (Nd) and terbium (Tb) by optimizing phases in order to develop hysteresis parameters such as maximum magnetization, coercivity and maximum energy product through variation in composition and heat treatment. The samples were prepared from arc-melted ingots of different compositions. The crystallization temperatures were obtained from the differential scanning calorimeter traces of the samples with the composition Nd4−x Tb x Fe71Co5Cu0·5Nb1B18·5 (x = 0·0, 0·2, 0·4, 0·6, 0·8 and 1·0). Depending on their crystallization temperatures, the samples were annealed at 600, 625, 650, 675 and 700°C for 10 min. Amorphosity and crystallization behavior were studied by X-ray diffraction using copper (Cu) Kα radiation (1·5418 Å). The Mössbauer spectra of all the samples were recorded at room temperature by using iron-57 (57Fe) Mössbauer spectrometry in transmission geometry with a constant-acceleration spectrometer. Magnetic properties were determined by a vibrating-sample magnetometer in the as-cast and annealed conditions. Although the highest values of coercivity and remanent ratio were found to be 4·18 kOe and 0·72, respectively, for the sample of composition Nd3Tb1Fe71Co5Cu0·5Nb1B18·5 annealed at 650°C with a higher concentration of terbium, the highest maximum energy product was determined to be 12·67 MGOe for the sample of Nd3·8Tb0·2Fe71Co5Cu0·5Nb1B18·5.

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High Temperature Magnetic Properties of Indirect Exchange Spring FePt/M(Cu,C)/Fe Trilayer Thin Films

Cited by 3 publications

References 53 publications

Interface mixing and its impact on exchange coupling in exchange biased systems

Interface mixing and its impact on exchange coupling in exchange biased systems

Exchange-Coupled Composite Media

Characterization of Nd(Tb)–Fe–B-based exchange-spring nanocomposite magnets

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