With the advancement of spintronics,tunability has emerged as a highly sought-after attribute of magnetic materials.Nevertheless,the comprehension of the terahertz(THz)optical characteristics of tunable magnetic mater...With the advancement of spintronics,tunability has emerged as a highly sought-after attribute of magnetic materials.Nevertheless,the comprehension of the terahertz(THz)optical characteristics of tunable magnetic materials driven by external excitation fields remains limited,necessitating further qualitative and quantitative investigation.Here we demonstrate the tunable optical properties of the LiFe5O8(LFO)/F-Mica structure under magnetic field by a THz time-domain spectroscopy(THz-TDS)system.The prepared LFO/F-Mica structure shows significant changes in dielectric properties and absorption coefficients under different magnetic fields,which is attributed to the interaction of the magnetic field with the spins of ordered magnetic ions(Fe3t)located in a non-centrosymmetric coordination environment.In addition,we investigate the specific contribution of the external laser field to the THz optical parameters of the LFO/F-Mica.The dielectric properties and THz optical response of LFO/F-Mica significantly depend on the laser power under 532 nm laser pumping.The modulation effects of these diverse external fields reveal the potential of lithium ferrites for applications in the THz band.These findings offer valuable insights for the development of tunable multifunctional THz magnetic devices,with potential applications in the fields of communications,medicine,and nondestructive testing.展开更多
基金the National Key Research and Development Program of China(Grant No.2022YFA1203502)the National Natural Science Foundation of China(NSAF,Grant No.U2230114).
文摘With the advancement of spintronics,tunability has emerged as a highly sought-after attribute of magnetic materials.Nevertheless,the comprehension of the terahertz(THz)optical characteristics of tunable magnetic materials driven by external excitation fields remains limited,necessitating further qualitative and quantitative investigation.Here we demonstrate the tunable optical properties of the LiFe5O8(LFO)/F-Mica structure under magnetic field by a THz time-domain spectroscopy(THz-TDS)system.The prepared LFO/F-Mica structure shows significant changes in dielectric properties and absorption coefficients under different magnetic fields,which is attributed to the interaction of the magnetic field with the spins of ordered magnetic ions(Fe3t)located in a non-centrosymmetric coordination environment.In addition,we investigate the specific contribution of the external laser field to the THz optical parameters of the LFO/F-Mica.The dielectric properties and THz optical response of LFO/F-Mica significantly depend on the laser power under 532 nm laser pumping.The modulation effects of these diverse external fields reveal the potential of lithium ferrites for applications in the THz band.These findings offer valuable insights for the development of tunable multifunctional THz magnetic devices,with potential applications in the fields of communications,medicine,and nondestructive testing.
