Exchange spin current

2017 ◽  
Author(s):  
E. Saitoh ◽  
K. Ando
Keyword(s):  
Magnetic Properties ◽  
Magnetic Fields ◽  
Exchange Interaction ◽  
Spin Wave ◽  
Magnetic Order ◽  
Magnetic Moments ◽  
Spin Current

This chapter introduces the concept of exchange spin current, which derives from rewriting the exchange interaction in magnets and formulating a spin-wave spin current. States of matter can be classified into several types in terms of magnetic properties. In paramagnetic and diamagnetic states, matter has no magnetic order and exhibits zero magnetization in the absence of external magnetic fields. In ferromagnetic states, the permanent magnetic moments of atoms or ions align parallel to a certain direction, and the matter exhibits finite magnetization even in the absence of external magnetic fields. In ferrimagnets, the moments align antiparallel but the cancellation is not perfect and net magnetization appears. This interaction that aligns spins is called the exchange interaction.

scholarly journals Синтез, структура и магнитные свойства многослойных наногетероструктур Fe|MgO|Cr|MgO|Fe

2021 ◽  
Vol 63 (9) ◽  
pp. 1306
Author(s):  
Е.М. Якунина ◽  
Е.А. Кравцов ◽  
Yu.N. Khaydukov ◽  
Н.О. Антропов ◽  
В.В. Проглядо
Keyword(s):  
Magnetic Properties ◽  
High Resolution ◽  
Exchange Interaction ◽  
Magnetic Moments ◽  
Ferromagnetic Material ◽  
Structural Studies ◽  
X Ray ◽  
Structural And Magnetic Properties ◽  
Metal Layers

Layered nanoheterostructures Fe | MgO | Cr | MgO | Fe is an artificial ferromagnetic material in which the exchange interaction of the magnetic moments of Fe layers through intermediate dielectric and metal layers can lead to magnetic configurations that are not realized in the well-studied Fe | MgO | Fe and Fe | Cr | Fe. In this work, we investigated the correlations of the structural and magnetic properties of layered nanoheterostructures Fe (10 nm) | MgO (1.5 nm) | Cr (t nm) | MgO (1.5 nm) | Fe (7 nm) (thickness t = 0.9 and 1.8 nm). Structural studies performed using X-ray diffractometry and high-resolution reflectometry confirmed the formation of a textured structure and revealed its well-defined layered character with sharp interlayer boundaries.

scholarly journals Generation of DC, AC, and Second-Harmonic Spin Currents by Electromagnetic Fields in an Inversion-Asymmetric Antiferromagnet

2019 ◽  
Vol 4 (4) ◽  
pp. 92
Author(s):  
Tatsuhiko N. Ikeda
Keyword(s):  
Magnetic Fields ◽  
Exchange Interaction ◽  
Electromagnetic Fields ◽  
Second Harmonic ◽  
Solvable Model ◽  
Spin Current ◽  
Quantum Master Equation ◽  
Spin Currents ◽  
Quantum Antiferromagnets ◽  
Simple Inversion

Manipulating spin currents in magnetic insulators is a key technology in spintronics. We theoretically study a simple inversion-asymmetric model of quantum antiferromagnets, where both the exchange interaction and the magnetic field are staggered. We calculate spin currents generated by external electric and magnetic fields by using a quantum master equation. We show that an ac electric field with amplitude E 0 leads, through exchange-interaction modulation, to the dc and second-order harmonic spin currents proportional to E 0 2 . We also show that dc and ac staggered magnetic fields B 0 generate the dc and ac spin currents proportional to B 0 , respectively. We elucidate the mechanism by an exactly solvable model, and thereby propose the ways of spin current manipulation by electromagnetic fields.

MAGNETIC BEHAVIOR OF Al2GdNi COMPOUND

2006 ◽  
Vol 20 (08) ◽  
pp. 401-408 ◽  
Author(s):  
M. COLDEA ◽  
V. POP ◽  
L. G. PASCUT ◽  
D. TODORAN ◽  
R. PACURARIU
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Magnetic Fields ◽  
Exchange Interaction ◽  
Magnetic Moment ◽  
Magnetic Measurements ◽  
Spontaneous Magnetization ◽  
Magnetic Behavior ◽  
Spin Fluctuations ◽  
Local Exchange

The magnetic properties of Al 2 GdNi compound have been investigated using magnetic measurements in the temperature range 4.2–300 K and with magnetic fields of up to 9 T. Al 2 GdNi orders ferromagnetically at Tc = 36.7 K with a magnetic moment of 7.25 μB/ f.u. , obtained from the spontaneous magnetization extrapolated to 0 K. The magnetic susceptibility obeys the Curie–Weiss law with μ eff = 8.6 μB/ f.u. and θp = 26.8 K . The results are discussed in terms of the Ruderman–Kittel–Kasuya–Yosida theory, the polarization of 5d electrons by the local exchange interaction 4f-5d and the spin fluctuations on Ni sites.

Coulomb and Exchange Interaction Effect on Magnetic Properties of MnO

2011 ◽  
Vol 110-116 ◽  
pp. 492-496
Author(s):  
Chewa Thassana ◽  
Wicharn Techitdheera
Keyword(s):  
Experimental Data ◽  
Magnetic Properties ◽  
Exchange Interaction ◽  
Coulomb Interaction ◽  
Magnetic Moments ◽  
Full Potential ◽  
Local Spin Density Approximation ◽  
Density Approximation ◽  
Spin Magnetic Moment ◽  
Good Correspondence

This calculation focus on the effect of Coulomb interaction U and exchange interaction J on spin magnetic moment Msof MnO by using the local spin density approximation plus the Coulomb interaction (LSDA+U) method within full potential linear muffin-tin orbital (FP-LMTO). Our calculated results indicated that the spin magnetic moments correlated to U and J. The relevant results exhibited the increasing spin magnetic moments with increasing Coulomb interaction and exchange interaction. Furthermore, equation of spin magnetic moments, which good correspondence to the experimental data, were obtained and the relation of U and J parameter was defined.

scholarly journals Single Crystal Growth and Physical Properties of Pyroxene CoGeO3

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 378
Author(s):  
Li Zhao ◽  
Zhiwei Hu ◽  
Hanjie Guo ◽  
Christoph Geibel ◽  
Hong-Ji Lin ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Crystal Growth ◽  
Physical Properties ◽  
Single Crystal ◽  
Single Crystals ◽  
Magnetic Moments ◽  
Single Crystal Growth ◽  
The Impact

We report on the synthesis and physical properties of cm-sized CoGeO3 single crystals grown in a high pressure mirror furnace at pressures of 80 bar. Direction dependent magnetic susceptibility measurements on our single crystals reveal highly anisotropic magnetic properties that we attribute to the impact of strong single ion anisotropy appearing in this system with TN∼33.5 K. Furthermore, we observe effective magnetic moments that are exceeding the spin only values of the Co ions, which reveals the presence of sizable orbital moments in CoGeO3.

scholarly journals Sensitivity of PS/CoPd Janus particles to an external magnetic field

RSC Advances ◽  
2021 ◽  
Vol 11 (28) ◽  
pp. 17051-17057
Author(s):  
Anna Eichler-Volf ◽  
Yara Alsaadawi ◽  
Fernando Vazquez Luna ◽  
Qaiser Ali Khan ◽  
Simon Stierle ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
External Magnetic Field ◽  
Magnetic Fields ◽  
Janus Particles ◽  
Weak Magnetic Fields

PS/CoPd Janus particles respond very sensitively to application of low external magnetic fields. Owing to the magnetic properties, the PS/CoPd particles may be used, for example, to sense the presence of weak magnetic fields as micro-magnetometers.

scholarly journals Effect of Intergrain Exchange Interaction on Magnetic Properties in Isotropic Nd-Fe-B Magnets

1993 ◽  
Vol 32 (Part 1, No. 2) ◽  
pp. 1032A-1032A ◽  
Author(s):  
Hirotoshi Fukunaga ◽  
Hiroshi Inoue
Keyword(s):  
Magnetic Properties ◽  
Exchange Interaction

MAGNETIC PROPERTIES OF U1-xDyxAlyNi5-y (y=0,1) SYSTEMS

2003 ◽  
Vol 17 (27n28) ◽  
pp. 1453-1460
Author(s):  
ILEANA LUPSA
Keyword(s):  
Magnetic Properties ◽  
Low Temperature ◽  
Spin Fluctuation ◽  
Magnetic Moments ◽  
Transition Temperatures ◽  
Temperature Range ◽  
Fluctuation Model ◽  
Magnetically Ordered

The magnetic properties of U 1-x Dy x Al y Ni 5-y (y=0,1) systems were investigated in the 2(5)–600 K temperature range and for fields up to 80 kOe. The systems having x≥0.2 are magnetically ordered with low transition temperatures and magnetization mainly due to the Dy contribution. The nickel exhibits magnetic moments, very weak in the low temperature range and well-defined effective moments over transition temperatures. The nickel behavior is discussed in terms of the spin fluctuation model.

Magnetic Properties of Embedded Rh Clusters in Ni Matrix

1995 ◽  
Vol 384 ◽  
Author(s):  
Zhi-Qiang Li ◽  
Yuichi Hashi ◽  
Jing-Zhi Yu ◽  
Kaoru Ohno ◽  
Yoshiyuki Kawazoe
Keyword(s):  
Magnetic Properties ◽  
Electronic Structure ◽  
First Principles ◽  
Density Functional ◽  
Local Density ◽  
Magnetic Moments ◽  
Functional Formalism ◽  
Rhodium Clusters ◽  
Spin Polarized ◽  
Local Density Functional

ABSTRACTThe electronic structure and magnetic properties of rhodium clusters with sizes of 1 - 43 atoms embedded in the nickel host are studied by the first-principles spin-polarized calculations within the local density functional formalism. Single Rh atom in Ni matrix is found to have magnetic moment of 0.45μB. Rh13 and Rhl 9 clusters in Ni matrix have lower magnetic moments compared with the free ones. The most interesting finding is tha.t Rh43 cluster, which is bulk-like nonmagnetic in vacuum, becomes ferromagnetic when embedded in the nickel host.

Exchange interaction and local environment effects on the magnetic properties ofFeNclusters

1992 ◽  
Vol 46 (16) ◽  
pp. 10432-10436 ◽  
Author(s):  
J. Dorantes-Da´vila ◽  
H. Dreysse´ ◽  
G. M. Pastor
Keyword(s):  
Magnetic Properties ◽  
Exchange Interaction ◽  
Local Environment ◽  
Environment Effects
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