朱礼军

朱礼军,男,博士,研究员,国科大岗位教授,博士生导师

2009本科毕业于北京师范大学,2014年博士毕业于中国科学院大学,随后在德国马丁路德大学(2014-2016)和美国康奈尔大学(2016-2021)从事博士后研究工作。2021年入选国家海外高层青年人才计划。2022加入半导体超晶格国家重点实验室,被聘为中科院半导体所研究员中国科学院大学岗位教授。

主要从事自旋流物理与非易失性自旋存储器研究,发表论文50余篇,其中以第一/通讯作者在PRL (3)Sci. Adv.(1)Appl. Phys. Rev.(1)Nat. Commun.(1)Adv. Mater.(1)Adv. Funct. Mater.(3)Phys. Rev. Applied (6)PB (4)等发表论文30余篇,拥有授权专利3项,多次磁学与磁性材料大会美国物理学会三月会议国内外会议大会报告邀请报告并担任分会主席现任国际期刊《Frontiers in Physics客座编辑和20多家期刊的审稿人(Phys. Rev.Nat.Commun.,Adv. Mater., Appl. Phys. Rev., Nano Lett.等)。

取得的重要科研成果所获奖励

1发现通过电阻率调控自旋霍尔效应和提高自旋轨道矩的新方法,发展出一系列高电荷-自旋转化效率、稳定、低阻、兼容磁隧道结和CMOS的新自旋霍尔金属制备出核心指标国际领先超低功耗亚纳秒SOT-MRAM存储器阵列

2实验观测到理论预言的自旋霍尔电导率随电子弛豫时间的特征变化规律,证实了内禀自旋霍尔效应Pt基体系自旋轨道矩的主导机制, 确定了通过增加电阻率提高自旋轨道矩的原理依据物理上限。

3发现界面自旋轨道耦合线性减小自旋轨道矩,界面自旋散射的主要机制提出了最小化界面自旋轨道耦合以减小自旋器件功耗技术方案

4发现在可集成于SOT-MRAMPt/FeCoB界面插入超薄顺磁NiO作为热磁振子功能层,可在室温下抑制自旋耗散,将自旋轨道矩效率提高至物理极限,理论功耗相比W, BiSe BiSb等其他强自旋流产生材料降低了2-3个数量级

5)发现界面自旋轨道矩产生效率比Pt自旋霍尔效应低至少2个数量级且自旋流耗散与原子扩散、磁近邻效应等界面效应无明显关联

6)发现常见重金属/铁磁体系磁阻尼因子主要来自双磁子散射,消除了传统分析中存在的诸多悖论提出通过超薄Hf插入层同时抑制磁阻尼因子和提高自旋轨道矩从而大幅降低器件功耗的技术方案。

7中心反演对称磁性单层膜中观测到一种起源于自旋霍尔效应自旋轨道矩。

8制备出超大垂直磁各向异性、超高矫顽力、巨磁光克尔角的Mn 基二元合金薄膜,首次在铁磁薄膜材料中观测到轨道双通道近藤效应及其对反常霍尔电导率负贡献。

相关成果获国际先进材料协会青年科学家奖2021)、中国教育部国家奖学金(2012

主要研究领域方向

自旋轨道矩新材料、自旋流物理、自旋存储器新方案

联系方式

E-mail: ljzhu@semi.ac.cn

欢迎报考本课题组的硕博连读生,也欢迎优秀博士后加盟团队。

在研/完成项目

1主持,国家海外高层次青年人才计划,2022-2025

2主持,中国科学院高层青年人才计划,2022-2025

3主持,中科院半导体所高层次青年人才启动经费,400万,2022-2027

代表性论文

1. L. Zhu*, L. Zhu, R. A. Buhrman, Fully spin-transparent magnetic interfaces enabled by insertion of a thin paramagnetic NiO layer, Phys. Rev. Lett. 126, 107204 (2021).

2. L. Zhu*, D. C. Ralph, R. A. Buhrman, Maximizing Spin-Orbit Torque Generated by the Spin Hall Effect of Pt, Appl. Phys. Rev. 8, 031308 (2021).

3. L. Zhu*, D. C. Ralph, R. A. Buhrman, Unveiling the mechanism of bulk spin-orbit torques within chemically disordered FexPt1-x single layers, Adv. Funct. Mater. 31, 2103898 (2021).

4. L. Zhu* and R. A. Buhrman, Absence of significant spin current generation in Ti/FeCoB bilayers with strong interfacial spin-orbit coupling, Phys. Rev. Appl. 15, L031001 (2021)(Letter).

5. L. Zhu*, D. C. Ralph, and R. A. Buhrman, Lack of simple correlation between switching current density and spin-orbit torque efficiency of perpendicularly magnetized spin current generator/ferromagnet heterostructures, Phys. Rev. Applied 15, 024059 (2021).

6. L. Zhu*, X. S. Zhang, D. A. Muller, D. C. Ralph, R. A. Buhrman, Observation of strong bulk damping-like spin-orbit torque in chemically disordered ferromagnetic single layers, Adv. Funct. Mater. 30, 2005201 (2020).

7. L. Zhu*, L. Zhu, D. C. Ralph, R. A. Buhrman, Origin of Strong Two-Magnon Scattering in Heavy-Metal/Ferromagnet/Oxide Heterostructures, Phys. Rev. Applied 13, 034038 (2020).

8. L. Zhu*, L. Zhu, S. Shi, D. C. Ralph, R. A. Buhrman, Energy-efficient ultrafast SOT-MRAMs based on low-resistivity spin Hall metal Au0.25Pt0.75, Adv. Electron. Mater. 6, 1901131 (2020).

9. L. Zhu*, L. Zhu, M. Sui, D. C. Ralph, R. A. Buhrman, Variation of the giant spin Hall conductivity in Pt with carrier lifetime, Sci. Adv. 5, eaav8025 (2019).

10. L. Zhu*, D. C. Ralph, R. A. Buhrman, Effective spin mixing conductance of the heavy-metal- ferromagnet interfaces, Phys. Rev. Lett. 123, 057203 (2019).

11. L. Zhu*, D. C. Ralph, R. A. Buhrman, Spin-orbit torques in heavy-metal-ferromagnet bilayers with varying strengths of interfacial spin-orbit coupling, Phys. Rev. Lett. 122, 077201 (2019).

12. L. Zhu*, K. Sobotkiewich, X. Ma, X. Li, D. C. Ralph, R. A. Buhrman*, Strong and tunable anti-damping spin-orbit torque and Dzyaloshinskii-Moriya interaction generated by low-resistivity Pd1-xPtx alloys, Adv. Funct. Mater. 29, 1805822 (2019).

13. L. Zhu*, R. A. Buhrman, Maximizing spin torque efficiency of Pt/Ti multilayers: Tradeoff between intrinsic spin Hall conductivity and carrier lifetime, Phys. Rev. Applied 12, 051002 (2019)(Letter).

14. L. Zhu*, L. Zhu, S. Shi, M. Sui, D. C. Ralph, R. A. Buhrman, Enhancing spin-orbit torque by strong interfacial scattering from ultrathin insertion layers, Phys. Rev. Applied 11, 061004 (2019)(Letter).

15. L. Zhu*, D. C. Ralph, R. A. Buhrman, Enhancement of spin transparency by interfacial alloying, Phys. Rev. B 99, 180404(R)(2019).

16. L. Zhu*, D. C. Ralph, R. A. Buhrman, Highly efficient spin current generation by the spin Hall effect in Au1-xPtx, Phys. Rev. Applied 10, 031001 (2018). (Letter, Editors’ suggestion)

17. L. J. Zhu*, D. C. Ralph, R. A. Buhrman, Irrelevance of magnetic proximity effect to spin orbit torques in heavy-metal/ferromagnet bilayers, Phys. Rev. B 98,134406 (2018).

18. L. J. Zhu, S.H. Nie, P. Xiong, P. Schlottmann, J. H. Zhao*, Orbital two-channel Kondo effect in epitaxial ferromagnetic L10-MnAl films, Nat. Commun. 7, 10817 (2016).

19. L. J. Zhu, S.H. Nie, K.K. Meng, D. Pan, J.H. Zhao*, H.Z. Zheng, Multifunctional L10-Mn1.5Ga Films with ultrahigh coercivity, giant perpendicular magnetocrystalline anisotropy and large magnetic energy product, Adv. Mater., 24, 4547 (2012).