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Author: search.filters.author.Poyai, AmpornSubject: search.filters.subject.Horizontal magnetic field

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    Item type:Publication,
    Effect of aspect ratio on horizontal field magnetoresistance
    (2019-01-01)
    Phetchakul, Toempong
    ;
    Chemthung, Yothin
    ;
    Poyai, Amporn
    This paper studies the aspect ratio (W/L), width (W) per length (L) of semiconductor resistor based on Hall effect current mode for horizontal magnetic field. At low concentration, 10<sup>14</sup> cm<sup>-3</sup>, W/L < 1, the length has direct effect to magnetoresistance. The W/L = 1, the large resistor provides magnetioresistance better than small device. The W/L ˃ 1, the width has inversely proportional to magnetoresistance. The %MR(B) is around 1 % at 0.5 T, 1 mA. The long resistor (W/L < 1) can create ΔR in the order of several kilo ohms and several hundred ohms for short resistor (W/L > 1). The contribution factors ρ(L/W) for high ΔR are low concentration and aspect ratio (W/L < 1). The high %MR(B) is contributed by high current density of short structure (W/L > 1). At high concentration 10<sup>17</sup> cm<sup>-3</sup>, aspect ratio and magnetoresistance are not sensitive to magnetic field because the Hall effect hardly occurs in high concentration material.