title: Nonvolatile modulation of electronic structure and correlative magnetism of L10-FePt films using significant strain induced by shape memory substrates.
abstract: Tuning the lattice strain (εL) is a novel approach to manipulate the magnetic, electronic, and transport properties of spintronic materials. Achievable εL in thin film samples induced by traditional ferroelectric or flexible substrates is usually volatile and well below 1%. Such limits in the tuning capability cannot meet the requirements for nonvolatile applications of spintronic materials. This study answers to the challenge of introducing significant amount of elastic strain in deposited thin films so that noticeable tuning of the spintronic characteristics can be realized. Based on subtle elastic strain engineering of depositing L10-FePt films on pre-stretched NiTi(Nb) shape memory alloy substrates, steerable and nonvolatile lattice strain up to 2.18% has been achieved in the L10-FePt films by thermally controlling the shape memory effect of the substrates. Introduced strains at this level significantly modify the electronic density of state, orbital overlap, and spin-orbit coupling (SOC) strength in the FePt film, leading to nonvolatile modulation of magnetic anisotropy and magnetization reversal characteristics. This finding not only opens an efficient avenue for the nonvolatile tuning of SOC based magnetism and spintronic effects, but also helps to clarify the physical nature of pure strain effect.
authors.affiliation: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.
authors.forename: Chun
authors.initials: C
authors.lastname: Feng
authors.affiliation: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.
authors.forename: Jiancheng
authors.initials: J
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Yang
authors.affiliation: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.|Centre for the Physics of Materials and Department of Physics, McGill University, Montreal, Quebec H3A2T8, Canada.
authors.forename: Kui
authors.initials: K
authors.lastname: Gong
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, China.
authors.forename: Shijie
authors.initials: S
authors.lastname: Hao
authors.affiliation: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Cao
authors.affiliation: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.
authors.forename: Chen
authors.initials: C
authors.lastname: Hu
authors.affiliation: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.
authors.forename: Jingyan
authors.initials: J
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, China.
authors.forename: Zhongqiang
authors.initials: Z
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, China.
authors.forename: Sirui
authors.initials: S
authors.lastname: Li
authors.affiliation: Department of Mechanical Engineering and Texas Center for Superconductivity (TcSUH), University of Houston, Houston, Texas 77204, USA.
authors.forename: Li
authors.initials: L
authors.lastname: Sun
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, China.
authors.forename: Lishan
authors.initials: L
authors.lastname: Cui
authors.affiliation: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.
authors.forename: Guanghua
authors.initials: G
authors.lastname: Yu
references.citation: Nat Mater. 2015 Feb;14(2):174-81
references.pmid: 25401920
references.citation: Phys Rev B Condens Matter. 1994 Dec 15;50(24):17953-17979
references.pmid: 9976227
references.citation: Adv Mater. 2012 Dec 18;24(48):6468-72
references.pmid: 23038060
references.citation: Phys Rev Lett. 1996 Oct 28;77(18):3865-3868
references.pmid: 10062328
references.citation: Nature. 2006 May 11;441(7090):199-202
references.pmid: 16688172
references.citation: Nano Lett. 2011 Jun 8;11(6):2522-6
references.pmid: 21557570
references.citation: Science. 2013 Mar 8;339(6124):1191-4
references.pmid: 23471404
references.citation: Phys Rev Lett. 2010 Feb 19;104(7):076402
references.pmid: 20366900
references.citation: Phys Rev Lett. 2014 Jul 18;113(3):037203
references.pmid: 25083663
references.citation: Science. 2012 May 4;336(6081):555-8
references.pmid: 22556245
references.citation: Phys Rev B Condens Matter. 1993 Jan 1;47(1):558-561
references.pmid: 10004490
references.citation: Nat Nanotechnol. 2009 Mar;4(3):158-61
references.pmid: 19265844
references.citation: Nat Nanotechnol. 2015 Apr;10(4):333-8
references.pmid: 25730601
references.citation: Science. 2007 Jan 19;315(5810):349-51
references.pmid: 17234941
references.citation: Science. 2009 Nov 13;326(5955):977-80
references.pmid: 19965507
references.citation: Nat Commun. 2013;4:1799
references.pmid: 23653211
references.citation: Phys Rev Lett. 2012 Mar 30;108(13):137203
references.pmid: 22540724
references.citation: Sci Rep. 2014 Sep 30;4:6505
references.pmid: 25266219
references.citation: Phys Rev Lett. 2013 Feb 15;110(7):077203
references.pmid: 25166400
references.citation: Phys Rev Lett. 2014 Jun 13;112(23):236601
references.pmid: 24972219
references.citation: Science. 1999 Aug 6;285(5429):867-70
references.pmid: 10436150
references.citation: Nat Mater. 2012 Apr 23;11(5):382-90
references.pmid: 22522638
references.citation: Phys Rev Lett. 2012 Aug 10;109(6):066402
references.pmid: 23006287