A study on the sensitivity of a spin valve with Conetic-based free layers

Jangyup Son; Jongkoo Lim; Jungho Ko; Sanghoon Kim; Soogil Lee; Jongill Hong

doi:10.1143/JJAP.51.033002

A study on the sensitivity of a spin valve with Conetic-based free layers

Jangyup Son, Jongkoo Lim, Jungho Ko, Sanghoon Kim, Soogil Lee, Jongill Hong

Department of Materials Science and Engineering

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

6 Citations (Scopus)

Abstract

An exchange-biased spin valve with Conetic-based free layers of Co ₉₀Fe ₁₀, Co ₉₀Fe ₁₀/Conetic and Conetic was investigated. The spin valve with the Co ₉₀Fe ₁₀ free layer showed the highest giant magnetoresistance (GMR) ratio of 4% but showed the lowest normalized sensitivity of 0.02 Oe ^-1. The GMR ratio of 3% and the normalized sensitivity of 0.07 Oe ^-1 were obtained for the spin valve with the Co ₉₀Fe ₁₀/Conetic free layer after annealing. The spin valve having the Conetic free layer showed softer magnetic properties and well-defined smaller anisotropy than the other spin valves. Though the spin valve showed the lowest GMR of 0.4% after annealing, it showed the highest normalized sensitivity of 0.14 Oe ^-1. Our study shows that further improvement in MR response of spin valves with Conetic-based free layers can make a spin valve sensor promising for detecting extremely low fields.

Original language	English
Article number	033002
Journal	Japanese journal of applied physics
Volume	51
Issue number	3 PART 1
DOIs	https://doi.org/10.1143/JJAP.51.033002
Publication status	Published - 2012 Mar

All Science Journal Classification (ASJC) codes

Engineering(all)
Physics and Astronomy(all)

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10.1143/JJAP.51.033002

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title = "A study on the sensitivity of a spin valve with Conetic-based free layers",

abstract = "An exchange-biased spin valve with Conetic-based free layers of Co 90Fe 10, Co 90Fe 10/Conetic and Conetic was investigated. The spin valve with the Co 90Fe 10 free layer showed the highest giant magnetoresistance (GMR) ratio of 4% but showed the lowest normalized sensitivity of 0.02 Oe -1. The GMR ratio of 3% and the normalized sensitivity of 0.07 Oe -1 were obtained for the spin valve with the Co 90Fe 10/Conetic free layer after annealing. The spin valve having the Conetic free layer showed softer magnetic properties and well-defined smaller anisotropy than the other spin valves. Though the spin valve showed the lowest GMR of 0.4% after annealing, it showed the highest normalized sensitivity of 0.14 Oe -1. Our study shows that further improvement in MR response of spin valves with Conetic-based free layers can make a spin valve sensor promising for detecting extremely low fields.",

author = "Jangyup Son and Jongkoo Lim and Jungho Ko and Sanghoon Kim and Soogil Lee and Jongill Hong",

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AU - Son, Jangyup

AU - Lim, Jongkoo

AU - Ko, Jungho

AU - Kim, Sanghoon

AU - Lee, Soogil

AU - Hong, Jongill

PY - 2012/3

Y1 - 2012/3

N2 - An exchange-biased spin valve with Conetic-based free layers of Co 90Fe 10, Co 90Fe 10/Conetic and Conetic was investigated. The spin valve with the Co 90Fe 10 free layer showed the highest giant magnetoresistance (GMR) ratio of 4% but showed the lowest normalized sensitivity of 0.02 Oe -1. The GMR ratio of 3% and the normalized sensitivity of 0.07 Oe -1 were obtained for the spin valve with the Co 90Fe 10/Conetic free layer after annealing. The spin valve having the Conetic free layer showed softer magnetic properties and well-defined smaller anisotropy than the other spin valves. Though the spin valve showed the lowest GMR of 0.4% after annealing, it showed the highest normalized sensitivity of 0.14 Oe -1. Our study shows that further improvement in MR response of spin valves with Conetic-based free layers can make a spin valve sensor promising for detecting extremely low fields.

AB - An exchange-biased spin valve with Conetic-based free layers of Co 90Fe 10, Co 90Fe 10/Conetic and Conetic was investigated. The spin valve with the Co 90Fe 10 free layer showed the highest giant magnetoresistance (GMR) ratio of 4% but showed the lowest normalized sensitivity of 0.02 Oe -1. The GMR ratio of 3% and the normalized sensitivity of 0.07 Oe -1 were obtained for the spin valve with the Co 90Fe 10/Conetic free layer after annealing. The spin valve having the Conetic free layer showed softer magnetic properties and well-defined smaller anisotropy than the other spin valves. Though the spin valve showed the lowest GMR of 0.4% after annealing, it showed the highest normalized sensitivity of 0.14 Oe -1. Our study shows that further improvement in MR response of spin valves with Conetic-based free layers can make a spin valve sensor promising for detecting extremely low fields.

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A study on the sensitivity of a spin valve with Conetic-based free layers

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