鎳鐵圖形化微結構中自旋傳輸及磁化翻轉行為之研究

陳東呈

doi:10.6842/NCTU.2011.00712

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鎳鐵圖形化微結構中自旋傳輸及磁化翻轉行為之研究

Study on Spin Transport and Magnetic Reversal Behavior in Patterned NiFe Structure

陳東呈 , Ph.D　　Advisor：姚永德;韋光華　　

英文 DOI： 10.6842/NCTU.2011.00712

自旋注入；磁性環；磁化翻轉；異常霍爾效應；渦旋方向；磁性穿隧介面；穿隧磁阻； spin injection ； magnetic ring ； magnetic reversal ； anomalous Hall effect ； vortex chirality ； Magnetic Tunnel Junction (MTJ) ； Tunnel Magnetoresistance (TMR)

Abstract │ Reference (120) │ Altmetrics

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Submicron- and nano-sized magnetic patterns were fabricated by e-beam lithography with lift-off techniques. The magnetoresistance (MR) measurements and quantitative analysis of magnetic force microscopy (MFM) were using to investigate the spin transports and magnetic reversal behaviors of these magnetic patterns. The commercial magnetic tunnel junctions (MTJs) were also measured at various temperatures to observe its thermal effects.
  The MFM were used to investigate a permalloy (Py) strip including two parts with different widths. The results indicated that the magnetic behaviors in different sections of the strip can be separated. The intensity of the phase-shift in the wider end is stronger than that in the narrower one. In contrast, the coercive force in the narrower end (9 Oe) is larger than that in the wider one (8 Oe). This is due to a strong anisotropic effect, and thus the Hc in the neck section could be strongly affected by the competition of the head-to-tail magnetic configurations in the two parts of the strip wire. This results in a small Hc in the neck section.
  For the thermal effect measurement of the MTJs, the MR ratio at 140 ℃ remained roughly 87% of that at room temperature. The operational temperature of electronic equipments is generally around 60–80 ℃ and the MR ratio of the MTJs at such temperatures be preserved in a considerable portion (90–95%) of that at room temperature.
  Single-layered and tri-layered spin valve rings were investigated by MR measurements. The critical current density of current-induced domain wall motion in the single-layered Py ring is about 1.5 ~ 3.5 × 107 A/cm2. With the present size, the tri-layered spin valve was possibly in the critical boundary between the formations of vortex and onion. Within this state, the soft ring was in vortex state and the hard one was in the forward onion state.
The nonlocal lateral spin valve (NLSV) devices were also constructed to detect the vortex chirality of the ring. The spin polarization induced in Cu diffusive channel of the NLSV devices in the present work was estimated at about 2%. The spin signals were also enhanced by shortening the distance of the diffusive channel.
Finally, we investigated the Cu-Py cross structure through which charge current flows and the resistance of the contact region. The concept of this structure was from the NLSV studies mentioned above. When choosing one voltage electrode as the spin injector itself, the probe arrangement was no longer the nonlocal geometry, and hence the signal from the local contact region was sensed. This signal exhibited a magnetic hysteretic loop, i.e., odd-asymmetric roughly equals to the zero field. We found the variation of the odd-asymmetric signals directly related to the switching of the spin injector at the contact region (the Cu-Py cross). It was attributed to the anomalous Hall effect of the injector at the contact region and the argument was supported by the results of size dependent investigation.

Reference ( 120 ) 〈TOP〉

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