赵海斌
博士 教授 博士生导师
复旦大学 信息学院
(1) 时间分辨磁光光谱,研究磁性材料与半导体的自旋动力学;(2) 非线性磁光光谱,研究表面与界面磁性,多铁材料的磁电耦合效应等;(3) 光、磁、电驱动下的超快自旋调控;(4) 新型太阳能材料的电荷产生、分离及输运的动力学。
个性化签名
- 姓名:赵海斌
- 目前身份:在职研究人员
- 担任导师情况:博士生导师
- 学位:博士
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学术头衔:
博士生导师
- 职称:高级-教授
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学科领域:
半导体技术
- 研究兴趣:(1) 时间分辨磁光光谱,研究磁性材料与半导体的自旋动力学;(2) 非线性磁光光谱,研究表面与界面磁性,多铁材料的磁电耦合效应等;(3) 光、磁、电驱动下的超快自旋调控;(4) 新型太阳能材料的电荷产生、分离及输运的动力学。
赵海斌,教授、博导,复旦大学信息学院副院长、信息学院学术委员会委员、光科学与工程系副主任。
1997.6 复旦大学物理系 本科;2000.6 复旦大学物理系 硕士;2006.2 美国威廉玛丽大学应用科学系 博士。
主要研究方向:
(1) 时间分辨磁光光谱,研究磁性材料与半导体的自旋动力学;
(2) 非线性磁光光谱,研究表面与界面磁性,多铁材料的磁电耦合效应等;
(3) 光、磁、电驱动下的超快自旋调控;
(4) 新型太阳能材料的电荷产生、分离及输运的动力学。
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209
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成果阅读
1175
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成果数
37
【期刊论文】Ultrafast magnetization dynamics of epitaxial Fe films on AlGaAs (001)
Appl. Phys. Lett.,2005,86():152512
2005年04月08日
Uniform magnetization precessions are generated by ultrafast optical excitation along the in-plane easy axis [100], as well as along the hard axis [1-10], in epitaxial Fe films grown on AlGaAs (001) over a wide range of applied magnetic fields. From the temporal evolution of the coherent magnetization precession, we determine the magnetic anisotropy constants and damping parameters which are crucial in designing fast magnetic switching devices and spintronics devices. This work is supported in part by the National Science Foundation, the Office of Naval Research, and the DARPA Spins in Semiconductors Program.
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【期刊论文】Strain and anisotropy effects on spin waves in epitaxial La0.67Sr0.33MnO3 films
Appl. Phys. Lett.,2005,86():182501
2005年04月25日
Uniform magnetization precession in the ferromagnetic state of La0.67Sr0.33MnO3 films grown on different substrates is investigated in the 50–300K temperature range in magnetic fields of up to 1.3T. The precession was induced by an optical pump pulse and probed by a time-delayed pulse using magneto-optical Kerr effect. The measured field dependence of the precession frequency agrees well with calculation from the Landau-Lifshitz-Gilbert equation using different uniaxial anisotropies for different substrates. The field-dependent relaxation times of the exponentially decaying precession are in 100–1400ps range. This work is supported in part by NSF (DMR-0137322, IMR-0114124, and PSU MRSEC DMR-0213623), DOE (DE-FG02-04ER46127), and the Petroleum Research Fund.
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【期刊论文】Interface Magnetization Reversal and Anisotropy in Fe/AlGaAs(001)
Phys. Rev. Lett.,2005,95(13):137202
2005年09月21日
The reversal process of the Fe interface layer magnetization in Fe/AlGaAs heterostructures is measured directly using magnetization-induced second-harmonic generation, and is compared with the reversal of the bulk magnetization as obtained from magneto-optic Kerr effect. The switching characteristics are distinctly different due to interface-derived anisotropy—single step switching occurs at the interface layer, while two-jump switching occurs in the bulk Fe for the magnetic field orientations employed. The angle between the interface and bulk magnetization may be as large as 40–85 degrees. Such interface switching will dominate the behavior of nanoscale structures.
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【期刊论文】Photoinduced coherent magnetization precession in epitaxial La0.67Ca0.33MnO3 films
Phys. Rev. B,2006,73(1):014417
2006年01月19日
Optically excited uniform magnetization precession in the ferromagnetic state of La0.67Ca0.33MnO3 films grown on different substrates is investigated by the time-resolved magneto-optic Kerr effect. The parameters of magnetic anisotropy are determined from the measured field dependence of the precession frequency. The dominant anisotropy contribution in the film grown on SrTiO3(001) is the strain-induced easy-plane anisotropy. In the strain-free films on NdGaO3(110), we discover a uniaxial in-plane anisotropy that results from the interface due to the tilting of the oxygen octahedra in NdGaO3.
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【期刊论文】Ultrafast interface magnetization dynamics in Fe∕AlGaAs (001) heterostructure
Appl. Phys. Lett. ,2007,91():052111
2007年08月02日
Time-resolved magnetization-induced second-harmonic generation is used to initiate and monitor coherent electronic spin precession in the Fe interface layer of a Fe∕AlGaAs (001) heterostructure. The frequency, phase, and hysteretic behavior of the interface magnetization precession are found to be different from the bulk Fe film. The results indicate that faster magnetization switching can be achieved in nanostructures where interface properties dominate. This work was supported in part by the National Science Foundation, the Office of Naval Research, and the DARPA Spins in Semiconductors Program.
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Phys. Rev. B,-0001,78(1):014408
-1年11月30日
We report on transient reflectivity and magneto-optical Kerr measurements from the colossal magnetoresistance compounds La0.67Ca0.33MnO3 (LCMO), La0.67Sr0.33MnO3 (LSMO), and Sr2FeMoO6 (SFMO) as a function of temperature and magnetic field. In LCMO and LSMO, an unusually slow (∼1 μs) carrier relaxation component is revealed in the transient reflectivity traces. The component disappears as the transition temperature is approached from below. This slow decay process is attributed to spin-lattice relaxation of carriers in localized states and shows a close relationship with the spectral weight near the Fermi surface. The attribution is further supported by our pump-probe magneto-optical Kerr measurements. In addition to the clear observation of magnetic precessions, a long-lived exponentially decaying background reflects the spin-related relaxation of photoexcited electrons. In contrast to manganites, the temperature dependence of transient reflectivity is negligible, although there is a significant change in transient Kerr rotation in SFMO. Our results show that the dynamics of charge, spin, and lattice are strongly correlated with each other in the manganites, but the spin degree of freedom is thermally insulated from the electron and lattice systems.
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【期刊论文】Photoinduced spin waves in Fe/AlGaAs (001) heterostructure
Phys. Stat. Sol. (c) ,-0001,5(8):2627-2631
-1年11月30日
Photoinduced spin waves are investigated for Fe films on AlGaAs (001) using the time resolved magneto‐optical Kerr effect. We observe first and second order standing spin waves as well as uniform magnetization precession. The anisotropy fields and exchange stiffness constant are obtained from the field and azimuthal dependence of the spin wave frequencies using the Landau‐Lifshitz‐Gilbert equation. A comparison with spin wave resonance measurements reveals a more pronounced interface effect on the low order standing spin waves in thin films. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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Phys. Rev. Lett.,2008,100(11):117208
2008年03月21日
Photoinduced magnetization dynamics is investigated in chemically ordered (LaMnO3)2n/(SrMnO3)n superlattices using the time-resolved magneto-optic Kerr effect. A monotonic frequency-field dependence is observed for the n=1 superlattice, indicating a single spin population consistent with a homogeneous hole distribution. In contrast, for n≥2 superlattices, a large precession frequency is observed at low fields indicating the presence of an exchange torque in the dynamic regime. We attribute the emergence of exchange torque to the coupling between two spin populations—viscous and fast spins.
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【期刊论文】Detection of coherent acoustic phonons by time-resolved second-harmonic generation
Phys. Rev. B,2011,83(21):212302
2011年06月28日
We report on observation of coherent longitudinal acoustic phonons in Fe/AlGaAs (001) heterostructure by time-resolved second-harmonic generation (TRSHG). The phonon induces not only a fast and highly damped oscillatory signal but also a long-lived one that exhibits an oscillating period identical to that obtained from the reflectivity measurement. The long-lived oscillatory second-harmonic generation is generated by an electric field modulated at 42.5 GHz because of the interference of the incident beam and the reflected light by the propagating phonon. TRSHG lets us probe the internal field modulated by phonons and differentiate their impacts at the interface and in the bulk.
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【期刊论文】Coherent Spin Precession via Photoinduced Antiferromagnetic Interactions in La0.67Ca0.33MnO3
Phys. Rev. Lett.,2011,107():207205
2011年11月11日
Pronounced spin precessions are observed in a geometry with negligible canting of the magnetization in ferromagnetic La0.67Ca0.33MnO3 thin films using the time-resolved magneto-optical Kerr effect. The precession amplitude monotonically decreases with increasing field, indicating that the coherent spin rotation may be triggered by a transient exchange field and not by demagnetization and/or anisotropy field modulation. We attribute the transient exchange field to emergent antiferromagnetic interactions due to charge transfer and modification of the kinetic energy of eg electrons under optical excitation.
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