(華東交通大學(xué) 基礎(chǔ)科學(xué)學(xué)院，南昌 330013)
摘 要: 微磁學(xué)理論為基礎(chǔ)，采用三維動(dòng)力學(xué)模型研究了Sm-Co/α-Fe雙層膜的內(nèi)稟矯頑力與外場取向的關(guān)系，以預(yù)測交換耦合雙層膜(硬磁層和軟磁層)磁性體系的磁性。結(jié)果表明：隨外場角度(外磁場方向與硬磁層易軸間的夾角)的增大，內(nèi)稟矯頑力減小；但當(dāng)軟磁層厚度小于其臨界尺寸或軟磁層厚度遠(yuǎn)大于其臨界尺寸時(shí)，出現(xiàn)局域極小及局域極大現(xiàn)象；外場角度較小時(shí)，隨軟磁層厚度的增加，內(nèi)稟矯頑力出現(xiàn)一峰值；這表明適當(dāng)方向的外場有助于獲得比較高的內(nèi)稟矯頑力。采用能壘分析法對此結(jié)果進(jìn)行定性解釋。
關(guān)鍵字: 交換耦合雙層膜；微磁學(xué)；內(nèi)稟矯頑力；磁場取向
（School of Basic Science, East China Jiaotong Uinversity, Nanchang 330013, China）
Abstract:To forecast the magnetism of hard/soft exchange-coupling bilayers, the relation between the intrinsic coercive field of the bilayers and the angle between orientation of magnetic field and easy axes of hard layer was investigated by using three-dimension dynamic model based on micromagnetic theory. The results show that the intrinsic coercive field decreases with increasing angle. But for the thickness of soft layer smaller than a critical thickness or far larger than the critical thickness, there exist a local minimum at small angle and a local maximum at big angle. For the small angle, with increasing thickness of soft layer, there exists a peak in the calculated intrinsic coercive field curve as a function of soft layer thickness. This indicates that the appropriate magnetic field angle is beneficial to the intrinsic coercive field, and these results are interpreted qualitatively based on the energy-barrier analysis.
Key words: exchange-coupling bilayer; micromagnetic; intrinsic coercive field; magnetic field orientation
