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首頁(yè)> 外文期刊>Journal of Applied Physics >Study of synthetic ferrimagnet-synthetic antiferromagnet structures for magnetic sensor application
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Study of synthetic ferrimagnet-synthetic antiferromagnet structures for magnetic sensor application

機(jī)譯：用于磁傳感器的合成鐵磁體-合成反鐵磁體結(jié)構(gòu)的研究

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There has been a growing interest in using both synthetic ferrimagnet (SF) free and synthetic antiferromagnet (SAF) pinned layers for head and memory applications. In particular, for linear sensor applications, these structures lower the magnetostatic fields present at the free layer through the reduction of its effective thickness (t_(eff)~(SF)). This allows higher sensitivity but at the expense of an increased offset field H_0(Neel coupling field H_f+ interlayer demagnetizing field H_d~(SAF)). In this work, results on a series of patterned 3 X 1 and 6 X 2 μm~2 top-pinned SF-SAF spin valves are analyzed and compared with a three-dimensional micromagnetic simulation in order to clarify the role of the different ferromagnetic layers in the overall offset field and sensitivity. H_0 varies as 1/t_(eff)~(SF)[t_(eff)~(SF) = (M_at_a-M_bt_b)/M_(eff)~(SF)]. The magnetostatic field acting on the SF coming from the SAF (H_d~(SAF)) can act as a biasing field, partially counterbalancing the Neel coupling field (H_f) leading to a reduction of H_0. In this work the offset field was reduced from an initial value of 25 Oe in a quasicompensated SAF to a value of -6 Oe, by unbalancing the SAF and consequently increasing its effective moment (t_(eff)~(SF) = 15 A).
機(jī)譯：對(duì)于磁頭和存儲(chǔ)器應(yīng)用，人們?cè)絹?lái)越關(guān)注使用無(wú)合成鐵磁（SF）和合成反鐵磁（SAF）固定層。特別地，對(duì)于線性傳感器應(yīng)用，這些結(jié)構(gòu)通過(guò)減小其有效厚度（t_（eff）?（SF））來(lái)降低自由層處的靜磁場(chǎng)。這允許更高的靈敏度，但是以增加的偏移場(chǎng)H_0（尼爾耦合場(chǎng)H_f +層間消磁場(chǎng)H_d?（SAF））為代價(jià)。在這項(xiàng)工作中，分析了一系列圖案化的3 X 1和6 X 2μm?2頂部固定SF-SAF自旋閥的結(jié)果，并將其與三維微磁模擬進(jìn)行比較，以闡明不同鐵磁層的作用在總的偏移場(chǎng)和靈敏度。 H_0隨著1 / t_（eff）?（SF）[t_（eff）?（SF）=（M_at_a-M_bt_b）/ M_（eff）?（SF）]而變化。作用于來(lái)自SAF的SF的靜磁場(chǎng)（H_d?（SAF））可以用作偏置場(chǎng)，部分抵消Neel耦合場(chǎng)（H_f），從而導(dǎo)致H_0減小。在這項(xiàng)工作中，通過(guò)使SAF失衡并因此增加其有效力矩（t_（eff）?（SF）= 15 A），將偏移場(chǎng)從準(zhǔn)補(bǔ)償SAF中的初始值25 Oe減小到-6 Oe。 。

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