A study on pinned layer magnetization processes in different antiferromagnetic coupling systems of spin-valves

Zhijun Yang; Dehua Han; Sining Mao; Hong Wang; Ghanim Al-Jumaily; Pat J. Ryan; Peter Crozier; Shu Chen Y Tsen; Martha McCartney; Mike Scheinfein

doi:10.1063/1.372503

A study on pinned layer magnetization processes in different antiferromagnetic coupling systems of spin-valves

Zhijun Yang, Dehua Han, Sining Mao, Hong Wang, Ghanim Al-Jumaily, Pat J. Ryan, Peter Crozier, Shu Chen Y Tsen, Martha McCartney, Mike Scheinfein

Research output: Contribution to journal › Conference article › peer-review

8 Scopus citations

Abstract

In this paper we report on magnetization reversal processes of pinned layers in different ferromagnetic and anti-ferromagnetic bilayer and spin-valve structures by observing hysteresis, switching field distribution (SFD), and time-dependent effects. The fact that time-dependent coercivity H_c tendency is more pronounced in ordered AF materials than that of disordered AF materials implies a spin reversal of some AF grains with locally low pinning field and low blocking temperature. We propose a simple qualitative model to explain our results in terms of a distribution of the pinning reversal field and temperature in AF layer, which may be due to a grain size distribution in the AF layer and an incomplete and inhomogeneous phase transformation in some ordered AF materials. High resolution electron microscopy (HREM) results reveal that lattice spacing does change from place to place in AF region of some ordered AF materials. The evidence indicates an incomplete and inhomogeneous phase transformation in the ordered AF systems, supporting the results of the magnetization reversal process study.

Original language	English (US)
Pages (from-to)	5729-5731
Number of pages	3
Journal	Journal of Applied Physics
Volume	87
Issue number	9 II
DOIs	https://doi.org/10.1063/1.372503
State	Published - May 2000
Event	44th Annual Conference on Magnetism and Magnetic Materials - San Jose, CA, United States Duration: Nov 15 1999 → Nov 18 1999

ASJC Scopus subject areas

General Physics and Astronomy

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10.1063/1.372503

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title = "A study on pinned layer magnetization processes in different antiferromagnetic coupling systems of spin-valves",

abstract = "In this paper we report on magnetization reversal processes of pinned layers in different ferromagnetic and anti-ferromagnetic bilayer and spin-valve structures by observing hysteresis, switching field distribution (SFD), and time-dependent effects. The fact that time-dependent coercivity Hc tendency is more pronounced in ordered AF materials than that of disordered AF materials implies a spin reversal of some AF grains with locally low pinning field and low blocking temperature. We propose a simple qualitative model to explain our results in terms of a distribution of the pinning reversal field and temperature in AF layer, which may be due to a grain size distribution in the AF layer and an incomplete and inhomogeneous phase transformation in some ordered AF materials. High resolution electron microscopy (HREM) results reveal that lattice spacing does change from place to place in AF region of some ordered AF materials. The evidence indicates an incomplete and inhomogeneous phase transformation in the ordered AF systems, supporting the results of the magnetization reversal process study.",

author = "Zhijun Yang and Dehua Han and Sining Mao and Hong Wang and Ghanim Al-Jumaily and Ryan, {Pat J.} and Peter Crozier and Tsen, {Shu Chen Y} and Martha McCartney and Mike Scheinfein",

year = "2000",

month = may,

doi = "10.1063/1.372503",

language = "English (US)",

volume = "87",

pages = "5729--5731",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics Publising LLC",

number = "9 II",

note = "44th Annual Conference on Magnetism and Magnetic Materials ; Conference date: 15-11-1999 Through 18-11-1999",

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TY - JOUR

T1 - A study on pinned layer magnetization processes in different antiferromagnetic coupling systems of spin-valves

AU - Yang, Zhijun

AU - Han, Dehua

AU - Mao, Sining

AU - Wang, Hong

AU - Al-Jumaily, Ghanim

AU - Ryan, Pat J.

AU - Crozier, Peter

AU - Tsen, Shu Chen Y

AU - McCartney, Martha

AU - Scheinfein, Mike

PY - 2000/5

Y1 - 2000/5

N2 - In this paper we report on magnetization reversal processes of pinned layers in different ferromagnetic and anti-ferromagnetic bilayer and spin-valve structures by observing hysteresis, switching field distribution (SFD), and time-dependent effects. The fact that time-dependent coercivity Hc tendency is more pronounced in ordered AF materials than that of disordered AF materials implies a spin reversal of some AF grains with locally low pinning field and low blocking temperature. We propose a simple qualitative model to explain our results in terms of a distribution of the pinning reversal field and temperature in AF layer, which may be due to a grain size distribution in the AF layer and an incomplete and inhomogeneous phase transformation in some ordered AF materials. High resolution electron microscopy (HREM) results reveal that lattice spacing does change from place to place in AF region of some ordered AF materials. The evidence indicates an incomplete and inhomogeneous phase transformation in the ordered AF systems, supporting the results of the magnetization reversal process study.

AB - In this paper we report on magnetization reversal processes of pinned layers in different ferromagnetic and anti-ferromagnetic bilayer and spin-valve structures by observing hysteresis, switching field distribution (SFD), and time-dependent effects. The fact that time-dependent coercivity Hc tendency is more pronounced in ordered AF materials than that of disordered AF materials implies a spin reversal of some AF grains with locally low pinning field and low blocking temperature. We propose a simple qualitative model to explain our results in terms of a distribution of the pinning reversal field and temperature in AF layer, which may be due to a grain size distribution in the AF layer and an incomplete and inhomogeneous phase transformation in some ordered AF materials. High resolution electron microscopy (HREM) results reveal that lattice spacing does change from place to place in AF region of some ordered AF materials. The evidence indicates an incomplete and inhomogeneous phase transformation in the ordered AF systems, supporting the results of the magnetization reversal process study.

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U2 - 10.1063/1.372503

DO - 10.1063/1.372503

M3 - Conference article

AN - SCOPUS:0001256746

SN - 0021-8979

VL - 87

SP - 5729

EP - 5731

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 9 II

T2 - 44th Annual Conference on Magnetism and Magnetic Materials

Y2 - 15 November 1999 through 18 November 1999

ER -

A study on pinned layer magnetization processes in different antiferromagnetic coupling systems of spin-valves

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