Imaging and magnetometry of switching in nanometer-scale iron particles

S. Gider; J. Shi; D. D. Awschalom; P. F. Hopkins; K. L. Campman; A. C. Gossard; A. D. Kent; S. Von Molnár

doi:10.1063/1.118032

Imaging and magnetometry of switching in nanometer-scale iron particles

S. Gider, J. Shi, D. D. Awschalom, P. F. Hopkins, K. L. Campman, A. C. Gossard, A. D. Kent, S. Von Molnár

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

Abstract

The reversal mechanisms in arrays of nanometer-scale (<40 nm diameter) iron particles are studied by low-temperature Hall magnetometry and room-temperature magnetic force microscopy. Rotation of the net array magnetization at low temperatures (20 K) occurs by both reversible and irreversible modes, the latter revealed by Barkhausen jumps. Spatially resolved measurements at room temperature show the particles to be single domain with remanence and coercivity indicating they are not superparamagnetic. Individual particles are observed to switch irreversibly over a small field range (<10 Oe) between preferred magnetic directions parallel to the growth direction of the particles. Scaling of the arrays offers the possibility of magnetic storage at the 45 Gbit/in.² level, nearly 50 times greater than current technology.

Original language	English (US)
Pages (from-to)	3269-3271
Number of pages	3
Journal	Applied Physics Letters
Volume	69
Issue number	21
DOIs	https://doi.org/10.1063/1.118032
State	Published - Nov 18 1996

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.118032

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title = "Imaging and magnetometry of switching in nanometer-scale iron particles",

abstract = "The reversal mechanisms in arrays of nanometer-scale (<40 nm diameter) iron particles are studied by low-temperature Hall magnetometry and room-temperature magnetic force microscopy. Rotation of the net array magnetization at low temperatures (20 K) occurs by both reversible and irreversible modes, the latter revealed by Barkhausen jumps. Spatially resolved measurements at room temperature show the particles to be single domain with remanence and coercivity indicating they are not superparamagnetic. Individual particles are observed to switch irreversibly over a small field range (<10 Oe) between preferred magnetic directions parallel to the growth direction of the particles. Scaling of the arrays offers the possibility of magnetic storage at the 45 Gbit/in.2 level, nearly 50 times greater than current technology.",

author = "S. Gider and J. Shi and Awschalom, {D. D.} and Hopkins, {P. F.} and Campman, {K. L.} and Gossard, {A. C.} and Kent, {A. D.} and {Von Moln{\'a}r}, S.",

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T1 - Imaging and magnetometry of switching in nanometer-scale iron particles

AU - Gider, S.

AU - Shi, J.

AU - Awschalom, D. D.

AU - Hopkins, P. F.

AU - Campman, K. L.

AU - Gossard, A. C.

AU - Kent, A. D.

AU - Von Molnár, S.

PY - 1996/11/18

Y1 - 1996/11/18

N2 - The reversal mechanisms in arrays of nanometer-scale (<40 nm diameter) iron particles are studied by low-temperature Hall magnetometry and room-temperature magnetic force microscopy. Rotation of the net array magnetization at low temperatures (20 K) occurs by both reversible and irreversible modes, the latter revealed by Barkhausen jumps. Spatially resolved measurements at room temperature show the particles to be single domain with remanence and coercivity indicating they are not superparamagnetic. Individual particles are observed to switch irreversibly over a small field range (<10 Oe) between preferred magnetic directions parallel to the growth direction of the particles. Scaling of the arrays offers the possibility of magnetic storage at the 45 Gbit/in.2 level, nearly 50 times greater than current technology.

AB - The reversal mechanisms in arrays of nanometer-scale (<40 nm diameter) iron particles are studied by low-temperature Hall magnetometry and room-temperature magnetic force microscopy. Rotation of the net array magnetization at low temperatures (20 K) occurs by both reversible and irreversible modes, the latter revealed by Barkhausen jumps. Spatially resolved measurements at room temperature show the particles to be single domain with remanence and coercivity indicating they are not superparamagnetic. Individual particles are observed to switch irreversibly over a small field range (<10 Oe) between preferred magnetic directions parallel to the growth direction of the particles. Scaling of the arrays offers the possibility of magnetic storage at the 45 Gbit/in.2 level, nearly 50 times greater than current technology.

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Imaging and magnetometry of switching in nanometer-scale iron particles

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