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Dede Djuhana,Bambang Soegijono,Hong-Guang Piao,Suhk Kun Oh,Seong Cho Yu,김동현 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have investigated the domain wall (DW) depinning behavior around the symmetric notches inferromagnetic nanowires by means of a micromagnetic simulation. We observed that the depinningfield decreases as the size of the notch increases. The change in the ratio of the height to the lengthof the bottom of the triangular notch is also considered, and a relatively insensitive variation of thedepinning field is observed with for ratios greater than 2. When the depinning field strength is varied,the DW internal structure is found to change during the depinning process. At a lower depinningfield (< 4 mT), the DW keeps its initial transverse wall structure whereas at a higher depinningfield (> 4 mT), the DW is depinned with a transformation of the inner structure with an antivortexsoon after the DW has escaped from the notch due to the Walker breakdown phenomenon. Veryinterestingly, with any external field, the depinned DW with antivortex inner structure is observedto move back to the original notch position. This is explainable because the notch acts as anattractive pinning potential for the DW.
Nanto, Dwi,Akbar, Hamdan,Soegijono, Bambang,Kurniawan, Budhy,Ghosh, Nilopal,Hwang, Jong-Soon,Yu, Seong-Cho Elsevier 2017 PHYSICA B-CONDENSED MATTER - Vol.526 No.-
<P><B>Abstract</B></P> <P>In this work, we report magnetocaloric effect of Nb-doped on La<SUB>0.7</SUB>Ca<SUB>0.3</SUB>Mn<SUB>1-<I>x</I> </SUB>Nb<SUB> <I>x</I> </SUB>O<SUB>3</SUB> (<I>x</I>=0, 0.002 and 0.01). Maximum magnetic entropy change under applied field of 10kOe obtained was –Δ<I>S</I> <SUB> <I>M</I> max</SUB> of 4.69Jkg<SUP>−1</SUP> K<SUP>−1</SUP>, 1.75Jkg<SUP>−1</SUP> K<SUP>−1</SUP> and 1.95Jkg<SUP>−1</SUP> K<SUP>−1</SUP> for <I>x</I>=0.0, 0.002 and 0.01, respectively. Total temperature span of both Nb-doped samples was 51K. A slight Nb-doped obtained a temperature span that went through the temperature span of the sample without Nb-doped, meanwhile more increasing Nb-doped might cause a little enhancement of maximum magnetic entropy change.</P>
Kurniawan Candra,Djuhana Dede,Soegijono Bambang,Kim Dong-Hyun 한국물리학회 2021 Current Applied Physics Vol.27 No.-
We report our micromagnetic simulations based on Landau-Lifshitz-Gilbert (LLG) equation for CoFeB nanowire which was exposed by sub-nanosecond magnetic pulse with varied pulse width between 100 and 1000 ps. It is found that the Walker Breakdown field (HWB) shifted as the field pulse duration decreased and reached at the highest value in case of 100 ps pulse width, then decreased steeply with respect to the pulse width up to 400 ps. HWB values are not significantly dependent for pulses longer than 500 ps. It is observed that, below the HWB, the exchange energy is larger than the demagnetization energy in the wider nanowire. By energy density analysis, it is understood that the increase of HWB values in the cases of narrower pulse width was to compensate the energy needed to move the DW.