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Search Publications by: Alexander Grutter (Fed)

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Displaying 1 - 25 of 87

Magnetic Uniformity and Limits on Room-Temperature Magnetization in Strained RuO2/TiO2 Films

May 29, 2025
Author(s)
Xuezhao Wu, Alexander Grutter, Ruizi Liu, Purnima P. Balakrishnan, Christy J. Kinane, Andrew J. Caruana, Yiyang Zhang, Xiaolin Ren, Yifan Jiang, Rolf Lortz, Shiming Lei, Qiming Shao
Altermagnets attract much attention due to their unique spin-splitting energy band and potential applications in spintronics. Ruthenium oxide (RuO2) has been reported as a metallic altermagnet, exhibiting long-range spin-splitting torque without

Reconfigurable All-Nitride Magneto-Ionics

May 7, 2025
Author(s)
Zhijie Chen, Christopher Jensen, Chen Liu, Yijing Liu, Christy Kinane, Andrew Caruana, Alexander Grutter, Julie Borchers, Xixiang Zhang, Kai Liu
The rapid advancement of generative artificial intelligence has significantly increased the demand for both energy and data storage. Voltage control of magnetism has emerged as a potential solution to reduce energy consumption in nanoelectronics. Magneto

Altermagnetic band splitting in 10 nm epitaxial CrSb thin films

May 1, 2025
Author(s)
Sandra Santhosh, Yongxi Ou, Paul Corbae, Wilson Yanez-Parreno, Supriya Ghosh, Alexei Fedorov, Makoto Hashimoto, Donghui Lu, Christopher Jensen, Julie Borchers, Alexander Grutter, Timothy Charlton, Anthony Richardella, K. A. Mkhoyan, Christopher Palmstrom, Nitin Samarth
Altermagnets are a newly identified family of collinear antiferromagnets with a momentum-dependent spin-split band structure of non-relativistic origin, derived from spin-group symmetry-protected crystal structures. Among candidate altermagnets, CrSb is

Chiral Microwave Nonreciprocity Demonstrated via Rayleigh and Sezawa Modes Supported in an Al0.58Sc0.42N/4H-SiC PlatformPlatform

March 24, 2025
Author(s)
A. Will-Cole, Xingyu Du, Bin Luo, Valeria Lauter, Alexander Grutter, Lisa Hackett, Michael Miller, Yuanchen Deng, Brandon Smith, Olivia Pitcl, Nian X. Sun, III Olsson, Matt Eichenfield
Chirality plays a crucial role in the helicity mismatch between surface acoustic waves and magnetic spin waves, leading to nonreciprocal transmission of acoustic power for coupled magnetoacoustic modes. Acoustic modes with both longitudinal and shear

Evidence of Antiferromagnetism in Ultrathin Metallic (111)-Oriented LaNiO3 Films

December 11, 2024
Author(s)
Margaret Kane, Purnima P. Balakrishnan, Okan Koksal, Megan Holtz, Andreas Suter, Michael R. Fitzsimmons, Chao-Yao Yang, Christoph Klewe, Paige Quarterman, Timothy R. Charlton, Andrew Herzing, Zaher Salman, Thomas Prokscha, Rossitza Pentcheva, Alexander Grutter, Yuri Suzuki
Antiferromagnets with exotic spin textures promise low-power spintronic devices with extremely high operating frequencies and resistance to external perturbations. In particular, the combination of highly tunable correlated electron physics, as in complex

Manipulating Interface Magnetism in Manganite Thin Film Membranes by Substrate Surface Chemistry

November 13, 2024
Author(s)
Purnima P. Balakrishnan, Qinwen Lu, Qing Wang, Shinichiro N. Muramoto, Paige Quarterman, Michael R. Fitzsimmons, Timothy R. Charlton, Xiaofang Zhai, Alexander Grutter
We demonstrate an unexpected substrate dependence of the magnetic properties of complex oxide thin film membranes. While the tunable magnetism of complex oxides is attractive for many applications, device integration has long been limited by the strict

Electrical Switching the Perpendicular Neel Order in a Collinear Antiferromagnet

November 1, 2024
Author(s)
Wenqing He, Tianyi Zhang, Yongjian Zhou, Caihua Wan, Hao Wu, Baoshan Cui, Jihao Xia, Ran Zhang, Tengyu Guo, Peng Chen, Mingkun Zhao, Leina Jiang, Alexander Grutter, Purnima P. Balakrishnan, Andrew Caruana, Christy Kinane, Sean Langridge, Guoqiang Yu, Cheng Song, Xiufeng Han
Spintronics is based on the electrical manipulation of magnetic order through current-induced spin torques. In collinear antiferromagnets with perpendicular magnetic anisotropy, binary states can be directly encoded in their opposite Néel order. The

Vertically Graded Fe-Ni Alloys with Low Damping and a Sizeable Spin-Orbit Torque

October 4, 2024
Author(s)
Rachel Maizel, Shuang Wu, Purnima P. Balakrishnan, Alexander Grutter, Christy Kinane, Andrew Caruana, Prabandha Nakarmi, Bhuwan Nepal, David Smith, Youngmin Lim, Juila Jones, Wyatt Thomas, Jing Zhao, F. Michel, Tim Mewes, Satoru Emori
Energy-efficient spintronic devices require a large spin-orbit torque (SOT) and low damping to excite magnetic precession. In conventional devices with heavy-metal/ferromagnet bilayers, reducing the ferromagnet thickness to approximately 1 nm enhances the

Extensive hydrogen incorporation is not necessary for superconductivity in topotactically reduced nickelates

August 27, 2024
Author(s)
Purnima P. Balakrishnan, Dan F. Segedin, Lin E. Chow, P. Quarterman, Shinichiro N. Muramoto, Mythili Surendran, Ranjan K. Patel, Harrison LaBollita, Grace A. Pan, Qi Song, Yang Zhang, Ismail El Baggari, Koushik Jagadish, Yu-Tsun Shao, Berit H. Goodge, Lena F. Kourkoutis, Srimanta Middey, Antia S. Botana, Jayakanth Ravichandran, A. Ariando, Julia Mundy, Alexander Grutter
A key open question in the study of layered superconducting nickelate films is the role that hydrogen incorporation into the lattice plays in the appearance of the superconducting state. Due to the challenges of stabilizing highly crystalline square planar

Probing Intrinsic Magnetization Dynamics of the Y3Fe5O12/Bi2Te3 Interface at Low Temperature

July 23, 2024
Author(s)
A. R. Will-Cole, Valeria Lauter, Alexander Grutter, Carsten Dubs, David Lidsky, Morris Lindner, Timmy Reimann, Nirjhar Bhattacharjee, Tzu-Ming Lu, Peter Sharma, Nichole Valdez, Charles Pearce, Todd Monson, Matthew Matzelle, Arun Bansil, Don Heiman, Nian Sun
Topological insulator–magnetic insulator (TI–MI) heterostructures hold significant promise in the field of spintronics, offering the potential for manipulating magnetization through topological surface state–enabled spin-orbit torque. However, many TI–MI

Coexistence of Superconductivity and Antiferromagnetism in Topological Magnet MnBi2Te4 Films

July 3, 2024
Author(s)
Wei Yuan, Zi-Jie Yan, Hemian Yi, Zihao Wang, Stephen Paolini, Yi-Fan Zhao, Ling-Jie Zhou, Annie G. Wang, Ke Wang, Thomas Prokscha, Zaher Salman, Andreas Suter, Purnima Balakrishnan, Alexander Grutter, Laurel E. Winter, John Singleton, Moses H. Chan, Cui-Zu Chang
The interface of two materials can harbor unexpected emergent phenomena. One example is interface-induced superconductivity. In this work, we employ molecular beam epitaxy to grow a series of heterostructures formed by stacking together two

Interfacial Magnetic Characteristics of Nearly Compensated Gadolinium Iron Garnet

May 4, 2024
Author(s)
Karthik Srinivasan, Alexander Grutter, Thomas Gage, P. Quarterman, Christy Kinane, Andrew Caruana, Guichuan Yu, Javier Garcia-Barriocanal, Sean Langridge, Bethanie Stadler
Reports on spin Hall magnetoresistance, magnonic spin currents from thermal gradients, and spin transfertorque magnetic random-access memory using compensated ferrimagnets largely discuss bulk magnetization but lack consideration of depth profiles or

Reduction-Induced Magnetic Behavior in LaFeO3-d Thin Films

March 4, 2024
Author(s)
Nathan Arndt, Eitan Hershkovitz, Labdhi Shah, Kristoffer Kjaernes, Chao-Yao Yang, Purnima Balakrishnan, Mohammed Shariff, Shaun Tauro, Daniel Gopman, Brian Kirby, Alexander Grutter, Thomas Tybell, Honggyu Kim, Ryan Need
The effect of oxygen reduction on the magnetic properties of LaFeO3−δ (LFO) thin films was studied to better understand the viability of LFO as a candidate for magnetoionic memory. Differences in the amount of oxygen lost by LFO and its magnetic behavior

Emergent Ferromagnetism in CaRuo3/CaMnO3 (111)-Oriented Superlattices

February 17, 2024
Author(s)
Margaret Kane, Churna Bhandari, Megan Holtz, Purnima Balakrishnan, Alexander Grutter, Michael R. Fitzsimmons, Chao-Yao Yang, Sashi Satpathy, Durga Paudyal, Yuri Suzuki
The boundary between CaRuO3 and CaMnO3 is an ideal test bed for emergent magnetic ground states stabilized through interfacial electron interactions. In this system, nominally antiferromagnetic and paramagnetic materials combine to yield interfacial

Interface-Induced Superconductivity in Magnetic Topological Insulators

February 9, 2024
Author(s)
Hemian Yi, Yi-Fan Zhao, Ying-Ting Chan, Jiaqi Cai, Ruobing Mei, Xianxin Wu, Zi-Jie Yan, Ling-Jie Zhou, Ruoxi Zhang, Zihao Wang, Stephen Paolini, Run Xiao, Ke Wang, Anthoney Richardella, John Singleton, Laurel Winter, Thomas Prokscha, Zaher Salman, Andreas Suter, Purnima Balakrishnan, Alexander Grutter, Moses Chan, Nitin Samarth, Xiaodong Xu, Weida Wu, Chao-Xing Liu, Cui-Zu Chang
The interface between two different materials can show unexpected quantum phenomena. In this study, we used molecular beam epitaxy to synthesize heterostructures formed by stacking together two magnetic materials, a ferromagnetic topological insulator (TI)

Tuning the Magnetic Anisotropy in artificially layered Mn3GaN/Mn3Ga Superlattices

January 31, 2024
Author(s)
Lu Guo, Neil Campbell, Alexander Grutter, Gahee Noh, Tianxiang Nan, P. Quarterman, Si-Young Choi, Thomas Tybell, Mark Rzchowski, Chang-Beom Eom
Artificially layered superlattices with two distinct spin structures offer new opportunities for manipulation of magnetic properties and interfacial spin configurations. We have grown epitaxial, coherent superlattices of ferrimagnetic Mn3Ga and

Controllable Conical Magnetic Structure and Spin-Orbit-Torque Switching in Symmetry-Broken Ferrimagnetic Films

January 23, 2024
Author(s)
Yaqin Guo, Jing Zhang, Purnima Balakrishnan, Alexander Grutter, Baishun Yang, Michael R. Fitzsimmons, Timothy Charlton, Haile Ambaye, Xu Zhang, Hanshen Huang, Zhi Huang, Jinyan Chen, Chenyang Guo, Xiufeng Han, Kang Wang, Hao Wu
Exploring and controlling chiral spin textures has attracted enormous interest from the perspective of fundamental research and spintronic applications. Here, we report the emergence of spiral spin states, bulk spin-orbit torque (SOT), and the

Constraints on Proximity-Induced Ferromagnetism in a Dirac Semimetal (Cd3As2)/Ferromagnetic Semiconductor (Ga1-xMnxSb) Heterostructure

September 11, 2023
Author(s)
Arpita Mitra, Run Xiao, Wilson Yanez, Yongxi Ou, Juan Chamorro, Tyrel M. McQueen, Alexander Grutter, Julie A. Borchers, Michael R. Fitzsimmons, Timothy Charlton, Nitin Samarth
Breaking time-reversal symmetry in a Dirac semimetal Cd3As2 through doping with magnetic ions or by the magnetic proximity effect is expected to cause a transition to other topological phases (such as a Weyl semimetal). To this end, we investigate the

Skyrmion-Excited Spin-Wave Fractal Networks

August 18, 2023
Author(s)
Nan Tang, W. L. N. C. Liyanage, Sergio A. Montoya, Sheena Patel, Lizabeth J. Quigley, Alexander Grutter, Michael R. Fitzsimmons, Sunil Sinha, Julie A. Borchers, Eric E. Fullerton, Lisa Debeer-Schmitt, Dustin A. Gilbert
Magnetic skyrmions exhibit unique, technologically relevant pseudo-particle behaviors which arise from their topological protection, including well-defined, three-dimensional breathing and gyration modes which occur at microwave frequencies. During dynamic

Composite Spin Hall Conductivity from Non-Collinear Antiferromagnetic Order

August 2, 2023
Author(s)
Steve Novakov, Peter B. Meisenheimer, Grace A. Pan, Patrick Kezer, Nguyen M. Vu, Alexander Grutter, Ryan F. Need, Julia Mundy, John Heron
Non-collinear antiferromagnets are an exciting new platform for studying intrinsic spin Hall effects, phenomena that arise from the materials' band structure, Berry phase curvature, and linear response to an external electric field. In contrast to

Negligible Magnetic Losses at Low Temperatures in Liquid Phase Epitaxy Grown Y3Fe5O12 Films

May 31, 2023
Author(s)
A. Will-Cole, James L. Hart, Valeria Lauter, Alexander Grutter, Carsten Dubs, Morris Lindner, Timmy Reimann, Nichole R. Valdez, Charles J. Pearce, Todd C. Monson, Judy J. Cha, Don Heiman, Nian X. Sun
Yttrium iron garnet (Y3Fe5O12, YIG) has a unique combination of low magnetic damping, high spin wave conductivity, and insulating properties that make it a highly attractive material for a variety of applications in the fields of magnetics and spintronics

Exchange-Biased Quantum Anomalous Hall Effect

May 19, 2023
Author(s)
Peng Zhang, Purnima P. Balakrishnan, Christopher Eckberg, Peng Deng, Tomohiro Nozaki, Sukong Chong, Patrick Quarterman, Megan Holtz, Brian B. Maranville, Gang Qiu, Lei Pan, Eve Emmanouilidou, Ni Ni, Masashi Sahashi, Alexander Grutter, Kang L. Wang
The quantum anomalous Hall (QAH) effect is characterized by a dissipationless chiral edge state with a quantized Hall resistance at zero magnetic field. Manipulating the QAH state is of great importance in both the understanding of topological quantum

Three-Dimensional Structure of Hybrid Magnetic Skyrmions Determined by Neutron Scattering

May 5, 2023
Author(s)
W. L. N. C. Liyanage, Nan Tang, Lizabeth J. Quigley, Julie A. Borchers, Alexander Grutter, Brian B. Maranville, Sunil Sinha, Nicolas Reyren, Sergio A. Montoya, Eric E. Fullerton, Lisa Debeer-Schmitt, Dustin A. Gilbert
Magnetic skyrmions are topologically protected chiral spin structures which present opportunities for next-generation magnetic data storage and logic information technologies. The topology of these structures originates in the geometric configuration of
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