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Scaling collapse of the irreversible magnetization of various ferromagnetic thin films

SCIENCE AND TECHNOLOGY OF SELF-ASSEMBLED MAGNETIC AND SUPERCONDUCTING NANO ARRAYS Dhananjay Kumar, North Carolina Agricultural & Technical State University, DMR 0403480. Scaling collapse of the irreversible magnetization of various ferromagnetic thin films.

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Scaling collapse of the irreversible magnetization of various ferromagnetic thin films

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  1. SCIENCE AND TECHNOLOGY OF SELF-ASSEMBLED MAGNETIC AND SUPERCONDUCTING NANO ARRAYSDhananjay Kumar, North Carolina Agricultural & Technical State University, DMR 0403480 Scaling collapse of the irreversible magnetization of various ferromagnetic thin films Schematic of formation of bonding and antibonding (*) molecular orbitals in FeCo molecule explaining the improvement in magnetic properties Scaling collapse of hysteretic data occurs for a wide variety of thin-film magnetic systems when ΔM(T,H)/ΔMmax(T) is plotted against the normalized magnetic field H/Hm(T) . Notation: SD(MD) refers to single (multiple) domain nanoparticle systems (Ni embedded in AlOx host), LPCMO is a phase separated (La,Pr)CaMnO3 manganite, Gd (gadolinium) films are polycrystallline and do not contain nanoparticles. For each curve, the temperature increases from left to right at fixed field.

  2. SCIENCE AND TECHNOLOGY OF SELF-ASSEMBLED MAGNETIC AND SUPERCONDUCTING NANO ARRAYSDhananjay Kumar, North Carolina Agricultural & Technical State University, DMR 0403480 RESEARCH TRAINING AND DEVELOPMENT: Over 10 undergraduate students, 5 graduate students, and several other researchers have worked with NIRT supported faculties and or NIRT supported research equipments. We have also developed two new courses that are related to nanoscience and in the department of Mechanical and Chemical Engineering. These courses are: (i) MEEN 685-Fundamentals of Nanoscience and Engineering and (ii) MEEN 785: Nanomaterials. 2009 REU students activties : 2 REU Teams Nanomaterials class visiting ORNL. Lectures by ORNL scientists (top), socialization, and visiting labs (bottom) were part of this trip. Publications and presentations: Applied Physics Letters 94, 151913 (2009), Applied Physics Letters 94, 012510 (2009), Acta Materialia, 57, 2040-2046 (2009), Applied Physics Letters, 93, 133105 (2008), Nanoscience and Nanotechnology, p. 1, vol. 8, (2008), Nano Letters, p. 1016, vol. 8, (2008), Journal of Applied Physics, p. 073910, vol. 104, (2008), Journal of Physics Condensed Matter, p. 385213, vol. 20, (2008), Applied Physics Letters, p. 042506, vol. 93, (2008), Applied Physics Letters, p. 102504, vol. 92, (2008), Applied Physics Letters, p. 082507, vol. 93, (2008).

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