Which spin valve for next giant magnetoresistance head generation? (invited)

Araki, S.; Sano, Megumi; Li, Shuxiang; Tsuchiya, Yoshihiro; Redon, O.; Sasaki, Takayoshi; Ito, Noriaki; Terunuma, K.; Morita, H.; Matsuzaki, M.

doi:10.1063/1.373351

Cited by 24 publications

(10 citation statements)

References 26 publications

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“…The magnitude of the fiel shift is called the exchange bias ͑EB͒ fiel B EB . Usually, the EB shift occurs after cooling the system with a saturated FM layer below the Néel temperature of the AFM layer or by layer deposition in an external magnetic field Despite four decades of research since its discovery 1,2 and the commercially available magnetic sensor devices, 3,4 the microscopic understanding of the EB effect is still not fully established. 5 In a recent paper, 6 we reported on EB studies in Co/CoO bilayers as a function of volume defects in the antiferromagnet.…”

Section: Introductionmentioning

confidence: 99%

Domain state model for exchange bias. II. Experiments

et al. 2002

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The exchange bias coupling at ferro-/antiferromagnetic interfaces of epitaxially grown Co/CoO bilayers can be intentionally enhanced and controlled by diluting the antiferromagnetic CoO layer, i.e., by introducing ͑i͒ nonmagnetic substitutions (Co 1Ϫx Mg x O) or ͑ii͒ Co deficiencie (Co 1Ϫy O). All intentional nonmagnetic cations or defects were placed away from the interface throughout the whole volume part of the antiferromagnetic layer. This way the roughness at the Co/CoO interface was kept practically the same. For both types of defects, the exchange bias fiel can be increased by a factor of 3 to 4. Hence, exchange bias is primarily not due to roughness at the interface but rather can be controlled by the defects in the volume part of the antiferromagnetic layer. We systematically investigate the dilution dependence of various phenomena of exchange bias, such as the vertical magnetization shift of the hysteresis loop, temperature dependence, training effect, cooling fiel dependence, and antiferromagnetic layer thickness dependence. All these phenomena are directly compared to results from Monte Carlo simulations and are shown to be consistently described by the domain state model for exchange bias. The combined experimental and theoretical finding suggest that the origin of exchange bias in Co/CoO results from a domain state in the volume part of the antiferromagnet stabilized by the defects.

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Section: Introductionmentioning

confidence: 99%

Domain state model for exchange bias. II. Experiments

et al. 2002

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“…Electrodeposited nickel-iron alloys, with in-plane magnetization, are used in a variety of industrial applications as, for example, in magnetic recording [1,2]. The magnetic properties of NiFe films vary with composition and thickness [3].…”

Section: Introductionmentioning

confidence: 99%

Magnetic anisotropy and its thickness dependence for NiFe alloy films electrodeposited on polycrystalline Cu substrates

Köçkar¹,

Alper²,

Kuru³

et al. 2006

Journal of Magnetism and Magnetic Materials

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“…Since the discovery of a giant magnetoresistance effect (GMR), a lot of efforts have been concentrated on finding a multilayer systems with special resistance characteristics on magnetic field RðHÞ: The most promising systems, which have already found a practical application, are spin-valve (SV) structures [1]. In this contribution, we show that the application of two different ferromagnetic materials as pinned layers in dual spin-valve structure (asymmetric dual spin-valve-ADSV) can result in novelty three-state GMR effectthree-state logic system.…”

Section: Introductionmentioning

confidence: 99%