Growth, structural and magnetic properties of high coercivity Co/Pt multilayers

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Co/Pt multilayer films ([Co (tCo nm)/Pt(1 nm)]10, 0.2 < tCo < 2 nm) with perpendicular magnetic anisotropy and room temperature coercivity Hc = 12-15 kOe are fabricated using electron beam evaporation at elevated growth temperatures onto Si(001)/SiNx(40nm)/Pt(20nm) substrate/seed structures. Hysteresis and magnetic force microscopy (MFM) studies indicate changes in the magnetization reversal mechanism along with a sharp increase in coercivity for growth temperatures higher TG {approx} 230 - 250 degrees C. Films grown at TG < 230 degrees C (tCo = 0.2 - 0.4 nm) show large micrometer size magnetic domains and rectangular hysteresis loops indicating magnetization reversal dominated by ... continued below

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Weller, D.; Folks, L.; Best, M.; Fullerton, E.EwqTerris, B.D.; Kusinski, G.J.; Krishnan, K.M. et al. November 1, 2000.

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Co/Pt multilayer films ([Co (tCo nm)/Pt(1 nm)]10, 0.2 < tCo < 2 nm) with perpendicular magnetic anisotropy and room temperature coercivity Hc = 12-15 kOe are fabricated using electron beam evaporation at elevated growth temperatures onto Si(001)/SiNx(40nm)/Pt(20nm) substrate/seed structures. Hysteresis and magnetic force microscopy (MFM) studies indicate changes in the magnetization reversal mechanism along with a sharp increase in coercivity for growth temperatures higher TG {approx} 230 - 250 degrees C. Films grown at TG < 230 degrees C (tCo = 0.2 - 0.4 nm) show large micrometer size magnetic domains and rectangular hysteresis loops indicating magnetization reversal dominated by rapid domain wall motion throughout the film following nucleation at Hn {approx} Hc. Films grown at TG > 250 degrees C show fine-grained MFM features on the sub-100 nm length scale and hysteresis studies indicate reversal dominated by localized switching of small clusters. The hysteresis curves for the highest coercivity films are sheared with a hysteresis slope alpha=4(pi)dM/dH|Hc approximately equal 1.5, which is close to the ideal value for completely decoupled grains of alpha =1. High resolution cross-sectional TEM with elemental analysis shows columnar grains extending throughout the multilayer stack. Sharp Co/Pt interfaces are found from TEM and grazing incidence X-ray diffraction. At higher TG, Co depletion and structural defects at the grain boundaries provide a mechanism for exchange decoupling of adjacent grains, which may result in the high coercivities observed. Anisotropy and magnetization values are estimated as Ku {approx} 8x106 erg/cc and MS {approx} 450 emu/cc (per total volume), hence Hk = 2Ku/MS {approx} 17.5 kOe for the highest coercivity Hc {approx} 15 kOe films.

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  • Journal Name: Journal of Applied Physics; Journal Volume: 89; Journal Issue: 11 PT2; Other Information: Journal Publication Date: Jun. 1, 2001

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  • Report No.: LBNL--46718
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 787092
  • Archival Resource Key: ark:/67531/metadc723711

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  • November 1, 2000

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 5, 2016, 5:09 p.m.

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Weller, D.; Folks, L.; Best, M.; Fullerton, E.EwqTerris, B.D.; Kusinski, G.J.; Krishnan, K.M. et al. Growth, structural and magnetic properties of high coercivity Co/Pt multilayers, article, November 1, 2000; California. (digital.library.unt.edu/ark:/67531/metadc723711/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.