Field-free spin-orbit torque(SOT)switching of perpendicular magnetization is essential for future spintronic devices.This study demonstrates the field-free switching of perpendicular magnetization in an HfO_(2)/Pt/Co/...Field-free spin-orbit torque(SOT)switching of perpendicular magnetization is essential for future spintronic devices.This study demonstrates the field-free switching of perpendicular magnetization in an HfO_(2)/Pt/Co/TaO_(x) structure,which is facilitated by a wedge-shaped HfO_(2)buffer layer.The field-free switching ratio varies with HfO_(2)thickness,reaching optimal performance at 25 nm.This phenomenon is attributed to the lateral anisotropy gradient of the Co layer,which is induced by the wedge-shaped HfO_(2)buffer layer.The thickness gradient of HfO_(2)along the wedge creates a corresponding lateral anisotropy gradient in the Co layer,correlating with the switching ratio.These findings indicate that field-free SOT switching can be achieved through designing buffer layer,offering a novel approach to innovating spin-orbit device.展开更多
目的:探讨不同病因所致左心室肥厚患者动态心电图(Holter)下间歇性的完全性左束支传导阻滞(CLBBB)情况及心率变异性特点。方法:选取2019年1月至2021年3月收治的左心室肥厚患者122例为研究对象,根据患者病因不同分为高血压所致的左心室...目的:探讨不同病因所致左心室肥厚患者动态心电图(Holter)下间歇性的完全性左束支传导阻滞(CLBBB)情况及心率变异性特点。方法:选取2019年1月至2021年3月收治的左心室肥厚患者122例为研究对象,根据患者病因不同分为高血压所致的左心室肥厚患者45例(A组)、冠心病所致的左心室肥厚患者35例(B组)、主动脉瓣狭窄所致的左心室肥厚患者22例(C组)、肥厚型心肌病所致的左心室肥厚患者20例(D组)。所有患者接受心脏彩超检查,测量左室射血分数(LVEF)、左室舒张末期内径(LVEDd)。接受24 h Holter动态心电图检查,记录QTc间期、RV5左室电压、平均心率,计算平均窦性心搏RR间期标准差(SDNN)及CLBBB发生率。结果:四组患者的LVEF、LVEDd、心率、QTc和RV5比较,差异无统计学意义(P>0.05)。A组的CLBBB发生率为35.56%,B组的CLBBB发生率为34.29%,均高于C组的9.09%、D组的10.00%(P<0.05)。A组的SDNN高于B组、C组、D组(P<0.05)。结论:不同病因所致左心室肥厚患者Holter下间歇性的CLBBB及心率变异性存在一定差异,CLBBB及心率变异性可为临床鉴别高血压、冠心病、主动脉瓣狭窄、肥厚型心肌病所致的左心室肥厚提供参考。展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No.12274108)the Natural Science Foundation of Zhejiang Province,China (Grant Nos.LY23A040008 and LY23A040008)the Basic Scientific Research Project of Wenzhou,China (Grant No.G20220025)。
文摘Field-free spin-orbit torque(SOT)switching of perpendicular magnetization is essential for future spintronic devices.This study demonstrates the field-free switching of perpendicular magnetization in an HfO_(2)/Pt/Co/TaO_(x) structure,which is facilitated by a wedge-shaped HfO_(2)buffer layer.The field-free switching ratio varies with HfO_(2)thickness,reaching optimal performance at 25 nm.This phenomenon is attributed to the lateral anisotropy gradient of the Co layer,which is induced by the wedge-shaped HfO_(2)buffer layer.The thickness gradient of HfO_(2)along the wedge creates a corresponding lateral anisotropy gradient in the Co layer,correlating with the switching ratio.These findings indicate that field-free SOT switching can be achieved through designing buffer layer,offering a novel approach to innovating spin-orbit device.
文摘目的:探讨不同病因所致左心室肥厚患者动态心电图(Holter)下间歇性的完全性左束支传导阻滞(CLBBB)情况及心率变异性特点。方法:选取2019年1月至2021年3月收治的左心室肥厚患者122例为研究对象,根据患者病因不同分为高血压所致的左心室肥厚患者45例(A组)、冠心病所致的左心室肥厚患者35例(B组)、主动脉瓣狭窄所致的左心室肥厚患者22例(C组)、肥厚型心肌病所致的左心室肥厚患者20例(D组)。所有患者接受心脏彩超检查,测量左室射血分数(LVEF)、左室舒张末期内径(LVEDd)。接受24 h Holter动态心电图检查,记录QTc间期、RV5左室电压、平均心率,计算平均窦性心搏RR间期标准差(SDNN)及CLBBB发生率。结果:四组患者的LVEF、LVEDd、心率、QTc和RV5比较,差异无统计学意义(P>0.05)。A组的CLBBB发生率为35.56%,B组的CLBBB发生率为34.29%,均高于C组的9.09%、D组的10.00%(P<0.05)。A组的SDNN高于B组、C组、D组(P<0.05)。结论:不同病因所致左心室肥厚患者Holter下间歇性的CLBBB及心率变异性存在一定差异,CLBBB及心率变异性可为临床鉴别高血压、冠心病、主动脉瓣狭窄、肥厚型心肌病所致的左心室肥厚提供参考。
