Savas Gider
Western Digital
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Publication
Featured researches published by Savas Gider.
IEEE Transactions on Magnetics | 2012
Andrew Tuggle; Savas Gider; Daniele Mauri; Michael Ho
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.
IEEE Transactions on Magnetics | 2016
Zhitao Diao; Yuankai Zheng; Christian Kaiser; Xin Jiang; Lifan Chen; Anup G. Roy; Chen Chien; Miaoyin Wang; Savas Gider; Daniele Mauri; Qunwen Leng
All-metal current-perpendicular-to-plane (CPP) giant magnetoresistance (GMR) read sensors with a shield-to-shield spacing (S2S) of 16-21 nm and a narrow track width of down to 25 nm were fabricated using ferromagnetic CoFeMnSi Heusler-alloy-based spin valves. Room temperature GMR ratios from these read sensors are obtained of up to 6% and 14-24% (ARA = 7.1-12.0 mΩμm2) at S2S = 16 and 21 nm, respectively. Studies and results of electron transport and CPP GMR support the sustainability and scalability of the CPP GMR process for Tb/in2 the areal density of magnetic recording. A universal parameter defined as magnetic resistivity for a sensor device, ΔRA/S2S in ohm micrometers, is proposed to gauge the practically and rationally applicable CPP GMR for the read sensor process. The investigation of the CPP GMR operation range and micromagnetic simulation demonstrates the feasibility of the CPP GMR read sensors at S2S = 21 nm for sustaining 1.0 Tb/in2 and of those at S2S = 16 nm for marginally supporting 2.0 Tb/in2 the areal density of magnetic recording, The future path to and potential of the technology for ever increasing areal density beyond 2.0 Tb/in2 are addressed with emphasis on the importance of further enhancing the CPP GMR for process margin improvement.
IEEE Transactions on Magnetics | 2013
Andrew Tuggle; Savas Gider; Daniele Mauri; Michael Ho
We propose a shield design that enhances linear resolution at a given shield-to-shield spacing. Patterning tabs in the cross-track direction of the shields at the read gap introduces a transverse anisotropy that can be further enhanced by using a high-moment material in the shield near the sensor. We use a finite element micromagnetic code to explore the performance of a read head embodying this design. We study the dependence of resolution on both the thickness and the moment of the shield tabs. The increased shield rotation improves the sensors linear resolution by more than 2% in absolute terms.
ieee international magnetics conference | 2017
Ekaterina Auerbach; Savas Gider; G. Albuquerque; Norbert Leder; Holger Arthaber; Dieter Süss
A single free layer (SFL) sensor consists of the free layer (FL), pinned layer (PL), and the antiferromagnetic (AFM) layer (Fig. 1(a)).
IEEE Transactions on Magnetics | 2016
Ekaterina Auerbach; Savas Gider; Gonçalo Albuquerque; Daniele Mauri
The parasitic capacitance of the reader affects performance through signal-to-noise ratio (SNR) in single readers and through crosstalk in dual 2-D magnetic recording readers. In a single reader, the majority of the capacitance is not from shield-to-shield capacitance but instead from lead-to-shield capacitance. The low-pass filtering of the reader circuit leads to an equalized SNR that depends on the parasitic capacitance. In a dual reader, the capacitance between the outer shields must be considered in addition to the capacitance between the inner shields in order to model accurately the crosstalk. Finite-element electromagnetic models and lumped element circuit models are validated with RF experiments on real heads.
ieee international magnetics conference | 2015
Zhitao Diao; Yuankai Zheng; Christian Kaiser; Xin Jiang; Lifan Chen; Anup G. Roy; Chen Jung Chien; Miaoyin Wang; Savas Gider; Daniele Mauri; Qunwen Leng
Magnetic Heusler alloys that benefit from their half-metal characteristics have recently seen significant progresses in material researches and process development. As a result, current perpendicular to plane (CPP) giant magnetoresistance (GMR) has been proportionally enhanced, at least but not limited, by an order of magnitude in devices that contain such magnetic Heusler alloys and all-metal layer stacking. Amongst a wide selection of ferromagnetic Heusler alloys, Co2MnSi and its variations show good process compatibility and high spin polarization that yields large CPP GMRs in spin valves. Recent experiments in Heusler alloy based spin valve structures epitaxially-grown on MgO (001) substrates have shown the room temperature ΔR/R can be as large as 75% in the CoMnFeSi Heusler alloy based pseudo spin valves grown on MgO (001) substrates. As a major application, CPP GMR reader technology has been extensively investigated in the last few years in response for the demand for increasing areal density in magnetic recording. One of recent industrial efforts shows that ΔR/R of 18 %, ΔRA= 9.0 mΩ μm2, is achievable in the reader sensors fabricated using the same CoMnFeSi Heusler alloy based and antiferromagnetically pinned spin valves grown on AlTiC wafers. First and most important, this implication of these results is that the advance of technology provides large potential to the CPP GMR in future reader sensor development to accommodate all the requirements for SNR improvement and solution to spin torque effect induced instability in devices. Second, a large compromise in the CPP GMR is observed when the film stack or the reader sensor gap is reduced in thickness. This originates from the nature of stack-structure-dependent electron transport and process imperfectness and constraints in reader sensor building. With strict requirement for high areal density recording at 1TB/in2 and beyond, for the time being, dealing with this compromise with the scaling down of the reader sensor gap will be a major challenge and the focus of effort to better shape this technology as a success. This talk will briefly review and discuss recent magnetic Heusler material and reader sensor development and limiting factors that might affect the use of such magnetic material in device fabrication and operation.
Archive | 2011
Kuok San Ho; Savas Gider; Daniele Mauri; Ming Mao; Sining Mao
Archive | 2011
Daniele Mauri; Chih-Ching Hu; Ming Mao; Kuok San Ho; Savas Gider
Archive | 2015
Daniele Mauri; Savas Gider; Hui Zhao; Ming Mao
Archive | 2015
Daniele Mauri; Savas Gider; Hui Zhao