Current-in-Plane GMR Trilayer Head Design for Hard-Disk Drives: Characterization and Extendibility

Lamberton, R.; Seigler, Michael A.; Pelhos, K.; Zhou, Hua; McCurry, M.P.; Ormston, M.; Yi, Gary; McClean, G.; McLaughlin, T K; Kolbo, P.; Heininen, O.; Sapozhnikov, Victor B.; Mao, Sining

doi:10.1109/tmag.2006.888213

Cited by 24 publications

(6 citation statements)

References 6 publications

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“…The position of the peak corresponds to an interplanar distance of 2.122 Å, which is close to the value of the fcc (111) Co 3 Pt bulk alloy [26] and the one found in epitaxial hcp (0002) Co 3 Pt films [27][28][29]. The full width at half maximum of the peak leads to a perpendicular coherence length of 4.7 nm, which is slightly smaller than the nominal Co , and 6a can be indexed both as (11)(12)(13)(14)(15)(16)(17)(18)(19)(20), and (22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40) In the CoO layer, small grains with a typical size below 3 nm were found. However, also a few larger grains with sizes of more than 5 nm were observed.…”

Section: Structural Propertiessupporting

confidence: 76%

“…So far most of the studies of the EB effect were focused on F films with in-plane (IP) easy axis of magnetization [4,13,14]. However, AF/F composites exhibiting an out-of-plane (OOP) exchange bias effect are rather attractive for applications in magnetic sensor devices operating in a current-perpendicular-to-plane geometry as they reveal superior signal-to-noise ratio compared to the current-in-plane sensors [15][16][17][18][19]. In this respect, only a few reports on OOP exchange bias systems are available [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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Coercivity enhancement in exchange biased CoO/Co₃Pt bilayers

Kosub¹,

Schubert²,

Schletter³

et al. 2010

J. Phys. D: Appl. Phys.

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A study on the exchange bias effect in an hcp (0002)-textured Co 3 Pt alloy film biased by a thin CoO film is presented. The Co 3 Pt film reveals an out-of-plane easy axis of magnetization although it was grown on an amorphous silica substrate at room temperature. Similar exchange bias fields measured in in-plane and out-of-plane directions of the CoO/Co 3 Pt bilayer system were observed for maximum cooling field. Whereas a pronounced cooling field dependence of the exchange bias field is observed in-plane, it remains constant in out-of-plane direction. The temperature evolution of the coercivity and the shift of the hysteresis loop caused by the exchange bias effect are discussed in terms of thermal activation accounting for the temperature dependent competition between the interfacial exchange energy and the anisotropy energy of antiferromagnetic grains.

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Section: Structural Propertiessupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Coercivity enhancement in exchange biased CoO/Co₃Pt bilayers

Kosub¹,

Schubert²,

Schletter³

et al. 2010

J. Phys. D: Appl. Phys.

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“…Rottmayer and Zhu [1]- [3] originally proposed the trilayer sensor within the context of CPP GMR. Later work extended the design concept to CIP GMR and TMR [4]- [6]. There was renewed interest with the possibility of increasing the SNR through intrinsic noise cancellation properties [7], [8].…”

Section: Introductionmentioning

confidence: 99%

“…In the original work [1]- [3], the interlayer coupling was not considered. Later work focused on either negative [4] or positive [7]- [9] coupling but without considering side shields [10].…”

Section: Introductionmentioning

confidence: 99%

A Dual Free Layer Sensor With Side Shields

et al. 2012

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We use a hybrid finite element code to explore the design space of a dual free layer (or trilayer) magnetic sensor to understand the effect of the stripe height (SH) to track width (TW) ratio on the bias point, as well as the noise. Transfer curves and noise properties are found to be strongly sensitive to the SH/TW ratio compared to a standard single free layer sensor. Side shields can change the eigenmodes of the coupled system and modify the noise cancellation.Index Terms-Dual free layer sensor, magnetic recording, magnetic sensors, nanoscale devices, trilayer sensor.

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“…In particular inter-track interference (ITI) is expected to be one of the principal causes of noise in such high density systems [1]. It is crucial that future designs for hard drives maintain a high signal-to-noise ratio (SNR) so that acceptable biterror-rates are possible [2]. In current hard drives data are decoded from a single track at a time.…”

Section: Introductionmentioning

confidence: 99%