The role of ultra-small magnetic grains in disordered granular ferromagnets

Avraham Y. Dokow; Doron Barness; Aviad Frydman

doi:10.1142/S0219581X0500384X

The role of ultra-small magnetic grains in disordered granular ferromagnets

Avraham Y. Dokow, Doron Barness, Aviad Frydman

Department of Physics

Bar-Ilan University

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

Abstract

We present magnetoresistance (MR) measurements on two unique granular ferromagnetic geometries: nanosized granular systems and magnetic tunnel junctions employing a granular electrode. In both systems the saturation fields of the magnetoresistance as well as the MR magnitudes are much larger than that of usual granular films. We interpret these results as being due to the impact of ultrasmall grains. The presence of such nanograins in a random granular array is usually undetectable since their influence on transport, magnetization and magnetoresistance is negligible. Our samples emphasize the role played by these grains leading to a number of unique effects and potential applications.

Original language	English
Pages (from-to)	887-892
Number of pages	6
Journal	International Journal of Nanoscience
Volume	4
Issue number	5-6
DOIs	https://doi.org/10.1142/S0219581X0500384X
State	Published - Oct 2005

Bibliographical note

Funding Information:
We gratefully acknowledge fruitful discussions with R. Berkovits, Z. Ovadyahu, R. C. Dynes, F. Hellman and M. Pollak. This research was supported by the Israeli Science Foundation (grant number 326/02-3).

Funding

We gratefully acknowledge fruitful discussions with R. Berkovits, Z. Ovadyahu, R. C. Dynes, F. Hellman and M. Pollak. This research was supported by the Israeli Science Foundation (grant number 326/02-3).

Funders	Funder number
Israel Science Foundation	326/02-3

Keywords

Giant magnetoresistance
Granular ferromagnets

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10.1142/S0219581X0500384X

Cite this

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abstract = "We present magnetoresistance (MR) measurements on two unique granular ferromagnetic geometries: nanosized granular systems and magnetic tunnel junctions employing a granular electrode. In both systems the saturation fields of the magnetoresistance as well as the MR magnitudes are much larger than that of usual granular films. We interpret these results as being due to the impact of ultrasmall grains. The presence of such nanograins in a random granular array is usually undetectable since their influence on transport, magnetization and magnetoresistance is negligible. Our samples emphasize the role played by these grains leading to a number of unique effects and potential applications.",

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AB - We present magnetoresistance (MR) measurements on two unique granular ferromagnetic geometries: nanosized granular systems and magnetic tunnel junctions employing a granular electrode. In both systems the saturation fields of the magnetoresistance as well as the MR magnitudes are much larger than that of usual granular films. We interpret these results as being due to the impact of ultrasmall grains. The presence of such nanograins in a random granular array is usually undetectable since their influence on transport, magnetization and magnetoresistance is negligible. Our samples emphasize the role played by these grains leading to a number of unique effects and potential applications.

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The role of ultra-small magnetic grains in disordered granular ferromagnets

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