Spin-Polarized Transport Through Devices of Er Single-Ion Magnets and Its Derivatives
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ORIGINAL PAPER
Spin-Polarized Transport Through Devices of Er Single-Ion Magnets and Its Derivatives Jie Zhou 1 & Xue-Ming Sun 2 & Zheng-Chuan Wang 1 Received: 14 March 2020 / Accepted: 20 July 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract We will study the spin-polarized transport through devices of single-ion magnets. A device consisted of the scanning tunneling microscopy (STM) Co tip, the single-ion magnet (Cp*) Ln (COT) (Cp* represents pentamethyl pentacadiene; Ln represents ErIII, DyIII, HoIII; COT stands for cyclooctatetraene), and the Au(111) substrate is proposed. We calculate the current curve for the parallel and anti-parallel configurations for the device of Er single-ion magnet, and find that the tunnel magnetoresistance (TMR) changes with bias − 34~24%, which indicates it is promising for the application in magnetic storage. After comparing the currents through devices of (Cp*) Ln (COT) single-ion magnets, we find that Er single-ion magnet has a better rectifying character than Dy and Ho single-ion magnet, but Ho single-ion magnet has an obvious negative differential conductance. By analysis of their transmission spectrums, these properties are well explained. The spin-polarized transport for the derivatives of Er single-ion magnets is also investigated; we find that they have better rectification and negative differential conductance features, and have potential application on multifunctional molecular devices. Keywords Single-ion magnet . Rectification effect . Tunneling magnetoresistance
PACS 72.25-b85.65.+h75.50.Xx85.75.-d
1 Introduction As we know, if the magnetic materials are composed of molecules or organic matters, they are named as molecular magnet [1, 2]. Molecular magnet can not only be used in the study of fundamental physical method and magneto structural characterization but also be widely used in practical applications. Molecular magnets display many interesting physical and chemical features, such as slow relaxation of magnetization at low temperature, macroscopic quantum tunneling and quantum coherence, quantum phase transition, and quantum oscillation, which have potential applications in data storage, quantum information, and magnetic refrigeration etc.; it also plays an important role in spintronics. In fact, a new field—the molecular spintronics—has appeared in recent years [3–5], * Zheng-Chuan Wang [email protected] 1
Department of Physics & CAS Center for Excellence in Topological Quantum Computation, The University of Chinese Academy of Sciences, P. O. Box 4588, Beijing 100049, China
2
Beijing Electronic Science & Technology Institute, Beijing, China
where the molecular magnets concerned mainly focus on the single molecular magnet (SMM) [6–8], single-ion magnet (SIM) [9–11] etc. In molecular spintronics [3–5], the molecular devices can meet the requirements of high-density information storage, and can also be used as spin filters [12] and spin polarization rectifiers [13]. If we put the manganese phthalocyanine molecule on a cobalt/
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