M
Michael R. Fitzsimmons
Researcher at Oak Ridge National Laboratory
Publications - 213
Citations - 5808
Michael R. Fitzsimmons is an academic researcher from Oak Ridge National Laboratory. The author has contributed to research in topics: Magnetization & Ferromagnetism. The author has an hindex of 39, co-authored 203 publications receiving 5297 citations. Previous affiliations of Michael R. Fitzsimmons include Argonne National Laboratory & University of California, San Diego.
Papers
More filters
Journal ArticleDOI
Tunable (δπ, δπ)-Type Antiferromagnetic Order in α-Fe(Te,Se) Superconductors
Wei Bao,Wei Bao,Yiming Qiu,Yiming Qiu,Qingzhen Huang,Mark Green,Mark Green,Paweł Zajdel,Paweł Zajdel,Michael R. Fitzsimmons,Mikhail Zhernenkov,Sung Chang,M. H. Fang,M. H. Fang,B. Qian,E. K. Vehstedt,Jinhu Yang,H. M. Pham,Leonard Spinu,Zhiqiang Mao +19 more
TL;DR: In contrast with the predicted commensurate spin-density-wave order at the nesting wave vector (pi, 0), a completely different magnetic order with a composition tunable propagation vector (deltapi, deltapi) was determined for the parent compound Fe 1+y}Te in this powder and single-crystal neutron diffraction study as discussed by the authors.
Journal ArticleDOI
Incommensurate magnetic order in the alpha-Fe(Te,Se) superconductor systems
Wei Bao,Yiming Qiu,Qingzhen Huang,Mark Green,Paweł Zajdel,Michael R. Fitzsimmons,Mikhail Zhernenkov,Minghu Fang,B. Qian,E. K. Vehstedt,Jinhu Yang,H. M. Pham,Leonard Spinu,Zhiqiang Mao +13 more
TL;DR: In this paper, the authors reported neutron scattering studies that reveal a unique complex incommensurate antiferromagnetic order in the parent compound alpha-FeTe when the long-range magnetic order is suppressed by the isovalent substitution of Te with Se, short-range correlations survive in the superconducting phase.
Journal ArticleDOI
Asymmetric magnetization reversal in exchange-biased hysteresis loops
Michael R. Fitzsimmons,P. Yashar,Chris Leighton,Ivan K. Schuller,Josep Nogués,Charles F. Majkrzak,Joseph A. Dura +6 more
TL;DR: Polarized neutron reflectometry is used to probe the in-plane projection of the net-magnetization vector M--> of polycrystalline Fe films exchange coupled to twinned (110) MnF (2) or FeF ( 2) antiferromagnetic layers.
Journal ArticleDOI
Metal-insulator transition and its relation to magnetic structure in (LaMnO3)2n/(SrMnO3)n superlattices.
Anand Bhattacharya,Steven J. May,S. G. E. te Velthuis,Maitri Warusawithana,Xiaofang Zhai,B. Jiang,Jian-Min Zuo,Michael R. Fitzsimmons,S. D. Bader,James N. Eckstein +9 more
TL;DR: Measurements of transport, magnetization, and polarized neutron reflectivity reveal that the ferromagnetism is relatively uniform in the metallic state, and is strongly modulated in the insulating state, being high in LaMnO3 and suppressed in SrMmO3.
Journal ArticleDOI
Depth Profile of Uncompensated Spins in an Exchange Bias System
Sujoy Roy,Michael R. Fitzsimmons,Sungkyun Park,M. Dorn,Oleg Petracic,Oleg Petracic,Igor V. Roshchin,Zhi-Pan Li,Xavier Batlle,Xavier Batlle,Rafael Morales,Rafael Morales,Amit Misra,Xinghang Zhang,Karine Chesnel,Jeffrey B. Kortright,Sunil K. Sinha,Sunil K. Sinha,Ivan K. Schuller +18 more
TL;DR: In this article, the authors used the unique spatial sensitivity of polarized neutron and soft x-ray beams in reflection geometry to measure the depth dependence of magnetization across the interface between a ferromagnet and an antiferromagnetic magnet.