Magnetic clusters, intergranular exchange interaction and their microstructural basis in thin film longitudinal media

K. Tang; M. E. Schabes; C. A. Ross; L. He; R. Ranjan; T. Yamashita; R. Sinclair

doi:10.1109/20.619667

Magnetic clusters, intergranular exchange interaction and their microstructural basis in thin film longitudinal media

K. Tang^*, M. E. Schabes, C. A. Ross, L. He, R. Ranjan, T. Yamashita, R. Sinclair

^*Corresponding author for this work

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

7 Citations (Scopus)

Abstract

We have experimentally examined the micromagnetic structures in CoCrTa/Cr films deposited onto NiP/Al substrates at 25, 100, 150, 200 and 250°C. We prepared all the films in an acerased magnetic state. The Lorentz transmission electron microscopy images demonstrate a monotonie decrease of magnetic cluster size with increase of deposition temperature and the magnetic force microscopy results show a decrease of image contrast. This indicates a decrease of intergranular exchange coupling with increase of deposition temperature. Nanoprobe energy dispersive spectroscopy (EDS) reveals an increase of Cr segregation at CoCrTa grain boundaries with increase of deposition temperature. The correlation of micromagnetic and microcompositional observations supports that Cr segregation at grain boundaries is responsible for decoupling CoCrTa grains. Our nanoprobe EDS results also indicate that the Cr diffuses to the grain boundaries from the inside of the CoCrTa grains as opposed to a diffusion process involving the Cr underlayer.

Original language	English
Pages (from-to)	4074-4076
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	33
Issue number	5 PART 2
DOIs	https://doi.org/10.1109/20.619667
Publication status	Published - 1997
Externally published	Yes

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title = "Magnetic clusters, intergranular exchange interaction and their microstructural basis in thin film longitudinal media",

abstract = "We have experimentally examined the micromagnetic structures in CoCrTa/Cr films deposited onto NiP/Al substrates at 25, 100, 150, 200 and 250°C. We prepared all the films in an acerased magnetic state. The Lorentz transmission electron microscopy images demonstrate a monotonie decrease of magnetic cluster size with increase of deposition temperature and the magnetic force microscopy results show a decrease of image contrast. This indicates a decrease of intergranular exchange coupling with increase of deposition temperature. Nanoprobe energy dispersive spectroscopy (EDS) reveals an increase of Cr segregation at CoCrTa grain boundaries with increase of deposition temperature. The correlation of micromagnetic and microcompositional observations supports that Cr segregation at grain boundaries is responsible for decoupling CoCrTa grains. Our nanoprobe EDS results also indicate that the Cr diffuses to the grain boundaries from the inside of the CoCrTa grains as opposed to a diffusion process involving the Cr underlayer.",

author = "K. Tang and Schabes, \{M. E.\} and Ross, \{C. A.\} and L. He and R. Ranjan and T. Yamashita and R. Sinclair",

year = "1997",

doi = "10.1109/20.619667",

language = "English",

volume = "33",

pages = "4074--4076",

journal = "IEEE Transactions on Magnetics",

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TY - JOUR

T1 - Magnetic clusters, intergranular exchange interaction and their microstructural basis in thin film longitudinal media

AU - Tang, K.

AU - Schabes, M. E.

AU - Ross, C. A.

AU - He, L.

AU - Ranjan, R.

AU - Yamashita, T.

AU - Sinclair, R.

PY - 1997

Y1 - 1997

N2 - We have experimentally examined the micromagnetic structures in CoCrTa/Cr films deposited onto NiP/Al substrates at 25, 100, 150, 200 and 250°C. We prepared all the films in an acerased magnetic state. The Lorentz transmission electron microscopy images demonstrate a monotonie decrease of magnetic cluster size with increase of deposition temperature and the magnetic force microscopy results show a decrease of image contrast. This indicates a decrease of intergranular exchange coupling with increase of deposition temperature. Nanoprobe energy dispersive spectroscopy (EDS) reveals an increase of Cr segregation at CoCrTa grain boundaries with increase of deposition temperature. The correlation of micromagnetic and microcompositional observations supports that Cr segregation at grain boundaries is responsible for decoupling CoCrTa grains. Our nanoprobe EDS results also indicate that the Cr diffuses to the grain boundaries from the inside of the CoCrTa grains as opposed to a diffusion process involving the Cr underlayer.

AB - We have experimentally examined the micromagnetic structures in CoCrTa/Cr films deposited onto NiP/Al substrates at 25, 100, 150, 200 and 250°C. We prepared all the films in an acerased magnetic state. The Lorentz transmission electron microscopy images demonstrate a monotonie decrease of magnetic cluster size with increase of deposition temperature and the magnetic force microscopy results show a decrease of image contrast. This indicates a decrease of intergranular exchange coupling with increase of deposition temperature. Nanoprobe energy dispersive spectroscopy (EDS) reveals an increase of Cr segregation at CoCrTa grain boundaries with increase of deposition temperature. The correlation of micromagnetic and microcompositional observations supports that Cr segregation at grain boundaries is responsible for decoupling CoCrTa grains. Our nanoprobe EDS results also indicate that the Cr diffuses to the grain boundaries from the inside of the CoCrTa grains as opposed to a diffusion process involving the Cr underlayer.

UR - https://www.webofscience.com/wos/woscc/full-record/WOS:A1997XW56500190

UR - https://www.scopus.com/pages/publications/0031222727

U2 - 10.1109/20.619667

DO - 10.1109/20.619667

M3 - Journal Article

SN - 0018-9464

VL - 33

SP - 4074

EP - 4076

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 5 PART 2

ER -

Magnetic clusters, intergranular exchange interaction and their microstructural basis in thin film longitudinal media

Abstract

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