Free Layer Characterization of TMR Head with Multi-Stripe Height by Using Ferro Magnetic Resonance Analyzer (FMRA)

P. Weawhongse; Chiranut Sa-Ngiamsak; Wanchai Pijitrojana; Kasin Vichienchom

doi:10.4028/www.scientific.net/AMM.781.195

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 781Free Layer Characterization of TMR Head with...

Free Layer Characterization of TMR Head with Multi-Stripe Height by Using Ferro Magnetic Resonance Analyzer (FMRA)

Abstract:

As continued reducing the track width (TW) of magnetic read sensor for gaining areal density in hard disk drive (HDD) industry, stripe height (SH) is needed to be reduced as keeping aspect ratio(TW/SH) for maintain resistance and signal constant. This paper is proposed to characterize the free layer behavior of tunneling magneto resistive (TMR) head with multiple SH by using ferro magnetic resonance analyzer (FMRA) that is able to analyze by layer-level state without applying external field. The results are found that, at shorter SH, effective stiffness field of free layer is increased which is based on decreasing FMR amplitude and increasing FMR frequency. As a result, magnetic read sensor is shown less sensitivity and signal to noise ratio (SNR) with shorter SH. The SH is a correlated function of the effective stiffness field in free layer that is referred to changed shape anisotropy field which has an effect to read ability.

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Periodical:

Applied Mechanics and Materials (Volume 781)

Pages:

195-198

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.781.195

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Online since:

August 2015

Authors:

P. Weawhongse*, Chiranut Sa-Ngiamsak, Wanchai Pijitrojana, Kasin Vichienchom

Keywords:

Ferromagnetic Resonance Analyzer (FMRA), Free Layer, Reference Layer, Stiffness Field, Stripe Height (SH), Tunneling Magneto Resistive Head (TMR)

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