Zobrazeno 1 - 10
of 85
pro vyhledávání: '"Keavney, David"'
Autor:
Guo, Er-Jia, Desautels, Ryan, Lee, Dongkyu, Roldan, Manuel A., Liao, Zhaoliang, Charlton, Timothy, Ambaye, Haile, Molaison, Jamie, Boehler, Reinhard, Keavney, David, Herklotz, Andreas, Ward, T. Zac, Lee, Ho Nyung, Fitzsimmons, Michael R.
Publikováno v:
Phys. Rev. Lett. 122, 187202 (2019)
In the bulk, LaCoO3 (LCO) is a paramagnet, yet in tensile strained thin films at low temperature ferromagnetism (FM) is observed, and its origin remains unresolved. Polarized neutron reflectometry (PNR) is a powerful tool to determine the depth profi
Externí odkaz:
http://arxiv.org/abs/1903.03466
Autor:
Guo, Er-Jia, Desautels, Ryan, Keavney, David, Roldan, Manue A., Kirby, Brian J., Lee, Dongkyu, Liao, Zhaoliang, Charlton, Timothy, Herklotz, Andreas, Ward, T. Zac, Fitzsimmons, Michael R., Lee, Ho Nyung
The coexistence and coupling of ferroelasticity and magnetic ordering in a single material offers a great opportunity to realize novel devices with multiple tuning knobs. Complex oxides are a particularly promising class of materials to find multifer
Externí odkaz:
http://arxiv.org/abs/1902.00162
Autor:
Sinha, Kishan, Wang, Haohan, Wang, Xiao, Zhou, Liying, Yin, Yuewei, Wang, Wenbin, Cheng, Xuemei, Keavney, David J, Cao, Huibo, Liu, Yaohua, Wu, Xifan, Xu, Xiaoshan
Publikováno v:
Physical Review Letters 121, 237203 (2018)
To tune the magnetic properties of hexagonal ferrites, a family of magnetoelectric multiferroic materials, by atomic-scale structural engineering, we studied the effect of structural distortion on the magnetic ordering temperature (TN). Using the sym
Externí odkaz:
http://arxiv.org/abs/1901.11118
Intercalation of rare earth metals ($RE$ = Eu, Dy, and Gd) is achieved by depositing the $RE$ metal on graphene that is grown on silicon-carbide (SiC) and by subsequent annealing at high temperatures to promote intercalation. STM images of the films
Externí odkaz:
http://arxiv.org/abs/1811.06111
Publikováno v:
Phys. Rev. Materials 1, 054005 (2017)
X-ray magnetic circular dichroism (XMCD) reveal the magnetic properties of intercalated europium metal under graphene on SiC(0001). Intercalation of Eu nano-clusters (average size 2.5 nm) between graphene and SiC substate are formed by deposition of
Externí odkaz:
http://arxiv.org/abs/1710.07396
Autor:
Cao, Shi, Sinha, Kishan, Zhang, Xin, Zhang, Xiaozhe, Wang, Xiao, Yin, Yuewei, N'Diaye, Alpha T, Wang, Jian, Keavney, David J, Paudel, Tula R, Liu, Yaohua, Cheng, Xuemei, Tsymbal, Evgeny Y, Dowben, Peter A, Xu, Xiaoshan
Publikováno v:
Phys. Rev. B 95, 224428 (2017)
The magnetic interaction between rare-earth and Fe ions in hexagonal rare-earth ferrites (h-REFeO3), may amplify the weak ferromagnetic moment on Fe, making these materials more appealing as multiferroics. To elucidate the interaction strength betwee
Externí odkaz:
http://arxiv.org/abs/1703.08482
Autor:
Choi, Yongseong, Keavney, David J., Holt, Martin V., Uhlíř, Vojtěch, Arena, Dario, Fullerton, Eric E., Ryan, Philip J., Kim, Jong-Woo
First order phase transitions occur discretely from one state to another, however they often display continuous behavior. To understand this nature, it is essential to probe how the emergent phase nucleates, interacts and evolves with the initial pha
Externí odkaz:
http://arxiv.org/abs/1405.4319
Autor:
Wang, Hongwei, Solovyev, Igor V., Wang, Wenbin, Wang, Xiao, Ryan, Phillip, Keavney, David J., Kim, Jong-Woo, Ward, Thomas Z., Zhu, Leyi, Cheng, X. M., Shen, Jian, He, Lixin, Xu, Xiaoshan, Wu, Xifan
Publikováno v:
Phys. Rev. B 90, 014436 (2014)
Using combined theoretical and experimental approaches, we studied the structural and electronic origin of the magnetic structure in hexagonal LuFeO$_3$. Besides showing the strong exchange coupling that is consistent with the high magnetic ordering
Externí odkaz:
http://arxiv.org/abs/1312.6984
Autor:
Wang, Wenbin, Wang, Hongwei, Xu, Xiaoying, Zhu, Leyi, He, Lixin, Wills, Elizabeth, Cheng, Xuemei, Keavney, David J., Shen, Jian, Wu, Xifan, Xu, Xiaoshan
Publikováno v:
Appl. Phys. Lett. 101, 241907 (2012)
Hexagonal LuFeO$_3$ films have been studied using x-ray absorption and optical spectroscopy. The crystal splittings of Fe$^{3+}$ are extracted as $E_{e'}-E_{e"}$=0.7 eV and $E_{a_1'}-E_{e'}$=0.9 eV and a 2.0 eV optical band gap is determined assuming
Externí odkaz:
http://arxiv.org/abs/1210.0076
Autor:
Wang, Wenbin, Zhao, Jun, Wang, Wenbo, Gai, Zheng, Balke, Nina, Chi, Miaofang, Lee, Ho Nyung, Tian, Wei, Zhu, Leyi, Cheng, Xuemei, Keavney, David J., Yi, Jieyu, Ward, Thomas Z., Snijders, Paul C., Christen, Hans M., Wu, Weida, Shen, Jian, Xu, Xiaoshan
Publikováno v:
Phys. Rev. Lett. 110, 237601 (2013)
The crystal and magnetic structures of single-crystalline hexagonal LuFeO$_3$ films have been studied using x-ray, electron and neutron diffraction methods. The polar structure of these films are found to persist up to 1050 K; and the switchability o
Externí odkaz:
http://arxiv.org/abs/1209.3293