Inter/intra granular exchange and thermal activation in nanoscale granular magnetic materials

C. Morrison; L. Saharan; G. Hrkac; T. Schrefl; Y. Ikeda; K. Takano; J. J. Miles; T. Thomson

doi:10.1063/1.3644469

Inter/intra granular exchange and thermal activation in nanoscale granular magnetic materials

C. Morrison, L. Saharan, G. Hrkac, T. Schrefl, Y. Ikeda, K. Takano, J. J. Miles, T. Thomson

Research output: Contribution to journal › Article › peer-review

Abstract

We explain the effect of inter/intra granular exchange coupling and thermal activation on the switching behavior of nano-scale granular magnetic materials. For an ideal, non-interacting granular system, the minimum switching field occurs at 45 from the easy axis of the grains. We show through simulation and measurements, using a CoCrPt oxide-segregated granular film as a model system, that there is a clear shift in the angle of applied field at which the minimum switching field occurs. This arises solely due to incoherent reversal induced by inter-granular exchange coupling or incoherency within larger grains, rather than thermal activation. © 2011 American Institute of Physics.

Original language	English
Article number	132507
Journal	Applied Physics Letters
Volume	99
Issue number	13
DOIs	https://doi.org/10.1063/1.3644469
Publication status	Published - 26 Sept 2011

Keywords

chromium compounds
cobalt compounds
exchange interactions (electron)
granular materials
magnetic switching
magnetic thin films
nanomagnetics
perpendicular magnetic recording
remanence
segregation

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title = "Inter/intra granular exchange and thermal activation in nanoscale granular magnetic materials",

abstract = "We explain the effect of inter/intra granular exchange coupling and thermal activation on the switching behavior of nano-scale granular magnetic materials. For an ideal, non-interacting granular system, the minimum switching field occurs at 45 from the easy axis of the grains. We show through simulation and measurements, using a CoCrPt oxide-segregated granular film as a model system, that there is a clear shift in the angle of applied field at which the minimum switching field occurs. This arises solely due to incoherent reversal induced by inter-granular exchange coupling or incoherency within larger grains, rather than thermal activation. {\textcopyright} 2011 American Institute of Physics.",

keywords = "chromium compounds, cobalt compounds, exchange interactions (electron), granular materials, magnetic switching, magnetic thin films, nanomagnetics, perpendicular magnetic recording, remanence, segregation",

author = "C. Morrison and L. Saharan and G. Hrkac and T. Schrefl and Y. Ikeda and K. Takano and Miles, {J. J.} and T. Thomson",

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T1 - Inter/intra granular exchange and thermal activation in nanoscale granular magnetic materials

AU - Morrison, C.

AU - Saharan, L.

AU - Hrkac, G.

AU - Schrefl, T.

AU - Ikeda, Y.

AU - Takano, K.

AU - Miles, J. J.

AU - Thomson, T.

PY - 2011/9/26

Y1 - 2011/9/26

N2 - We explain the effect of inter/intra granular exchange coupling and thermal activation on the switching behavior of nano-scale granular magnetic materials. For an ideal, non-interacting granular system, the minimum switching field occurs at 45 from the easy axis of the grains. We show through simulation and measurements, using a CoCrPt oxide-segregated granular film as a model system, that there is a clear shift in the angle of applied field at which the minimum switching field occurs. This arises solely due to incoherent reversal induced by inter-granular exchange coupling or incoherency within larger grains, rather than thermal activation. © 2011 American Institute of Physics.

AB - We explain the effect of inter/intra granular exchange coupling and thermal activation on the switching behavior of nano-scale granular magnetic materials. For an ideal, non-interacting granular system, the minimum switching field occurs at 45 from the easy axis of the grains. We show through simulation and measurements, using a CoCrPt oxide-segregated granular film as a model system, that there is a clear shift in the angle of applied field at which the minimum switching field occurs. This arises solely due to incoherent reversal induced by inter-granular exchange coupling or incoherency within larger grains, rather than thermal activation. © 2011 American Institute of Physics.

KW - chromium compounds

KW - cobalt compounds

KW - exchange interactions (electron)

KW - granular materials

KW - magnetic switching

KW - magnetic thin films

KW - nanomagnetics

KW - perpendicular magnetic recording

KW - remanence

KW - segregation

U2 - 10.1063/1.3644469

DO - 10.1063/1.3644469

M3 - Article

SN - 0003-6951

VL - 99

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 13

M1 - 132507

ER -

Inter/intra granular exchange and thermal activation in nanoscale granular magnetic materials

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Keywords

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