(1. 中南大學(xué) 物理科學(xué)與技術(shù)學(xué)院， 長(zhǎng)沙 410083；
2. 中南大學(xué) 粉末冶金國家重點(diǎn)實(shí)驗(yàn)室， 長(zhǎng)沙 410083)
摘 要: 采用微磁學(xué)模擬的方法對(duì)不同直徑有限長(zhǎng)Ni納米線的矯頑力隨角度（外磁場(chǎng)與納米線長(zhǎng)軸之間的夾角）的變化關(guān)系Hc(θ)進(jìn)行了研究。 結(jié)果表明： 矯頑力隨角度的變化規(guī)律隨著納米線直徑的增大而改變； 當(dāng)直徑小于臨界直徑d0(39 nm)時(shí)， 納米線矯頑力隨著角度的增大而單調(diào)減小； 當(dāng)直徑大于臨界直徑d0時(shí)， 矯頑力隨角度的變化表現(xiàn)出較復(fù)雜的關(guān)系， 出現(xiàn)零角度局域極大現(xiàn)象以及中間某一角度的極大現(xiàn)象。 從反磁化機(jī)制的角度對(duì)矯頑力隨角度的變化規(guī)律進(jìn)行了解釋。
關(guān)鍵字: 鎳納米線; 微磁學(xué); 矯頑力; 角度; 反磁化機(jī)制
magnetic nanowires
（1. School of Physics Science and Technology, Central South University,
Changsha 410083, China;
2. State Key Laboratory of Powder Metallurgy, Central South University,
Changsha 410083, China）
Abstract: Angular dependence of the coercivity Hc(θ) of magnetic nanowires with different diameters was investigated by micromagnetic simulation, where θ is defined as the angle between the field direction and wire length）. The results show that Hc(θ) significantly depends on the nanowire diameter. For the nanowire diameter smaller than a critical diameter d0(39 nm), the coercivity decreases as the angle increases. For the diameters larger than the critical diameter, the angular dependence of coercivity has a complicated form. There are a local maximum at zero angle and a peek at middle angle on the Hc(θ) curve. The angular dependence of coercivity is interpreted in terms of magnetization reversal mechanism.
Key words: Ni nanowire; micromagnetics; coercivity; angle; magnetization reversal mechanism
