S. Lamba

FePt alloy systems in the L10 phase are characterized by high anisotropy values that lead to exceptionally high coercive fields, making them a primary candidate for high density data storage. In this paper, we report the synthesis of L10 FePt nanoparticles by thermal annealing of chemically disordered FePt nanoparticles. The high degree of ordering and high coercivity achieved in these systems is further studied using Monte Carlo simulations by incorporating the effects of anisotropy, interactions, and disorder, with a view to understand the role of these interactions. A comparison of the simulation results with the experiment results also helps us to estimate an anisotropy value of ?2.25?2.5?MJ?m?3.

10.1088/0022-3727/47/35/355002

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Characterization of SOI technology based MEMS differential capacitive accelerometer and its estimation of resolution by near vertical tilt angle measurements

Microsystem Technologies (2019)

Yashoda Parmar Nidhi Gupta Vinita Gond S. Lamba Siva Rama Krishna Vanjari

Tilt sensor

Characterization

10.1007/s00542-019-04561-6

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Role of Coulomb interaction in heavy-fermion systems: Calculation of effective mass

Journal of Chemical Sciences (1994)

S. Lamba S. K. Joshi

10.1007/bf02840684

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Growth of cobalt nanoparticles in Co–Al₂O₃ thin films deposited by RF sputtering

physica status solidi (a) (2016)

Rajan Goyal S. Lamba S. Annapoorni

Cobalt nanoparticles in Co–Al 2 O 3 films have been deposited by rf‐magnetron co‐sputtering of cobalt and alumina on Si <100> substrate. X‐ray diffraction (XRD) patterns were collected at room temperature for the as‐deposited as well as annealed thin films. The appearance of (002) reflection in XRD pattern indicates the presence of hcp‐Co nanoparticles with oriented growth along c ‐axis. The scanning electron microscopy (SEM) result shows the formation of truncated hexagonal nanoparticles at elevated temperatures. Rutherford backscattering (RBS) has also been performed to estimate the film thickness. The effect of grain growth, after annealing at higher temperature, on surface roughness has also been studied using atomic force microscopy (AFM). Magnetic measurements carried out at room temperature both in parallel and perpendicular configuration reveal easy axis orientation along in‐plane direction. However, a large value of coercivity along c ‐axis was attributed to the pinning due to the presence of oxide at grain boundaries. The pinning effect was also confirmed by the way of generating hysteresis using Monte Carlo simulation in a system of randomly distributed clusters of single domain interacting particles.

Rutherford backscattering spectrometry

10.1002/pssa.201532704

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