Anomalous Magneto Transport in amorphous TbFeCo thin films

ORAL

Abstract

TbFeCo has attracted some interests because of its high perpendicular anisotropy and tunable magnetic properties for nanomagnetic and spintronics application. In this study, we report a strong size dependence of the coercive field in 30 nm-thick Tb$_{30}$Fe$_{63.5}$Co$_{6.5 }$films with MgO capping. Magneto Optical Kerr effect (MOKE) and Vibrating Sample Magnetometer are performed on unpatterned films. The films exhibited strong PMA characteristics with M$_{S} \quad \sim $200 emu/cc, H$_{C}\sim $6000 Oe, and K$_{U} \quad \sim $ 5 x 10$^{6 }$erg/cc. The films were then fabricated into Hall bars with 500 nm, 50 $\mu $m and 500 $\mu $m in width. From anomalous Hall effect (AHE), H$_{C}$ was determined for these patterned films. For Hall bars with the width less than 50 $\mu $m, an increase in the coercivity field ($\sim $ 1.4 Tesla) was observed at room temperature. The temperature dependent of AHE was characterized from 50K to 300K. The thickness and composition dependent will also be studied and discussed.

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Authors

  • Nattawut Anuniwat

    Physics Department, University of Virginia, University of Virginia

  • Marc Costantine

    Materials Science Department, University of Virginia, University of Virginia

  • Jiwei Lu

    Materials Science Department, University of Virginia, Department of Materials Science and Engineering, University of Virginia, Materials Science and Engineering Department, University of Virginia, University of Virginia

  • Manli Ding

    Physics Department, University of Virginia, University of Virginia

  • Joseph Poon

    Physics Department, University of Virginia, University of Virginia