Siritaratiwat, Apirat

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Siritaratiwat, Apirat
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Siritaratiwat, A.
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apirat.si@kmitl.ac.th

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    Simulation of magnetic footprints for heat assisted magnetic recording
    (2017-05-01)
    Pituso, Kotchakorn
    ;
    Khunkitti, Pirat
    ;
    Kruesubthaworn, Anan
    ;
    Chooruang, Komkrit
    ;
    Tongsomporn, Damrongsak
    The heat assisted magnetic recording (HAMR) technology has been the promising candidate to overcome the thermal stability limitation at higher capacities of the hard disk drive. In this work, the characteristics of magnetic footprint of the medium written by HAMR were investigated through the micromagnetic simulations. The Voronoi granular media was firstly modeled, then the magnetic footprint technique was performed to observe the media behaviors at various linear densities. The results indicated that the pattern of magnetic footprint can be perverted at higher densities, which essentially causes a reduction of readback signal power. Also, the dependence of media grain size on the signal power shows that the larger grain size media can provide higher signal power at low linear density, while the smaller grain size media gives higher signal at high density. Thus, the magnetic footprint regarding the HAMR technology needs to be optimized to achieve the efficient recording system.
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    A practical crosstalk reduction technique applied to high-density hard disk interconnecting assembly traces
    (2011-01-01)
    Osaklang, S.
    ;
    Kruesubthaworn, A.
    ;
    Sivaratana, R.
    ;
    Supnithi, P.
    ;
    Ungvichian, V.
    A novel electromagnetic (EM) decoupling and crosstalk reduction technique applied to hard disk drive is presented. Grooves are introduced with different depths between conductors of the trace suspension assembly interconnects (TSAI). By using commercial EM simulation software, an induced voltage from an unwanted external field on TSAI is reduced in relation with groove depth. As much as 12.5-dB decoupling is observed for 25%-75% groove depths. The crosstalk reduction obtained over 1.0 dB for 1-4 GHz frequency band is achieved and the transmission bandwidth has increased by 20% at 75% groove depth. Hence, additional grooves will strengthen the immunity of TSAI at the reader sensor against external field disturbances as well as offer an improved transmission performance. © 2011 IEEE.
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    Structural Size Effect with Altered Temperature on MgO-based Magnetic Tunnel Junction Device during Current Flow
    (2016-01-01)
    Pomsanam, Veeraporn
    ;
    Warisarn, Chanon
    ;
    Siritaratiwat, Apirat
    ;
    Surawanitkun, Chayada
    Recently, the increase in high areal density of hard disk drive with the small bit cells affects the structural variation in the magnetic recording head. Therefore, the structural size effect on the altered temperature in the tunneling magetoresistance (TMR) head with the MgO-based magnetic tunnel junction structure was investigated. Results indicate that the temperature increment in the MgO layer and the antiferromagetic layer decreases significantly with decreasing the thickness of the MgO barrier. This is because the generated heat during the current flow is proportional to the TMR resistance which can be estimated by the resistance of the MgO barrier layer. The efficiency of the write/read process with the thermal effect in the magnetic recording head is the important parameter realized for development of the storage technology.