scholarly journals First-principle calculations of the exchange interaction characteristics for multilayer magnetic structures

2018 ◽  
Vol 185 ◽  
pp. 03007 ◽  
Author(s):  
Marina Mamonova ◽  
Vladimir Prudnikov
Keyword(s):  
Exchange Interaction ◽  
Giant Magnetoresistance ◽  
Multilayer Structures ◽  
Hard Disks ◽  
Magnetic Multilayer ◽  
Generalized Gradient ◽  
Magnetic Structures ◽  
Spintronic Devices ◽  
Ferromagnetic Layers ◽  
Projector Augmented Wave

Magnetic multilayer structures which consist of the ferromagnetic layers separated by nonmagnetic layers with giant magnetoresistance (GMR) are widely used as spintronic devices and read heads of hard disks. In this work magnetic and exchange interaction characteristics of Co/Cu/Co, Ni/Cu/Ni and Fe/Cr/Fe multilayer structures are studied by using VASP software package within the Projector Augmented Wave (PAW) method with generalized-gradient approximation (GGA PBE).The finite temperature magnetism of these structures was studied by Monte-Carlo simulations with the use of the exchange interaction parameters obtained from the ab initio results.

scholarly journals Control of the noncollinear interlayer exchange coupling

2020 ◽  
Vol 6 (48) ◽  
pp. eabd8861
Author(s):  
Zachary R. Nunn ◽  
Claas Abert ◽  
Dieter Suess ◽  
Erol Girt
Keyword(s):  
Exchange Coupling ◽  
Magnetic Moments ◽  
Interlayer Exchange Coupling ◽  
Magnetic Structures ◽  
Spintronic Devices ◽  
Spacer Layer ◽  
Ferromagnetic Layers ◽  
Almost All ◽  
Interlayer Exchange ◽  
Coupling Angle

Interlayer exchange coupling in transition metal multilayers has been intensively studied for more than three decades and is incorporated into almost all spintronic devices. With the current spacer layers, only collinear magnetic alignment can be reliably achieved; however, controlling the coupling angle has the potential to markedly expand the use of interlayer exchange coupling. Here, we show that the coupling angle between the magnetic moments of two ferromagnetic layers can be precisely controlled by inserting a specially designed magnetic metallic spacer layer between them. The coupling angle is controlled solely by the composition of the spacer layer. Moreover, the biquadratic coupling strength, responsible for noncollinear alignment, is larger than that of current materials. These properties allow for the fabrication and study of not yet realized magnetic structures that have the potential to improve existing spintronic devices.

Magneto-Optical Investigation of Thin-Film Magnetic Structures

2013 ◽  
Vol 543 ◽  
pp. 247-250 ◽  
Author(s):  
Natalia Tsidaeva ◽  
Viktorija Abaeva ◽  
Elena Enaldieva ◽  
Tamerlan T. Magkoev ◽  
Anatolij Turiev ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Giant Magnetoresistance ◽  
Magnetic Interaction ◽  
Antiferromagnetic Interaction ◽  
Multilayer Structures ◽  
Optical Investigation ◽  
Magnetic Structures ◽  
Magnetic Layers ◽  
Spacer Layer ◽  
Nonmagnetic Spacer

After the discovery of antiferromagnetic interaction [, giant magnetoresistance [ and oscillating magnetic interaction [, the exchange coupling between magnetic layers across the conductive nonmagnetic spacer layer in multilayer structures have been attracted much attention [4-.

Influence of anisotropy on magnetoresistance in magnetic multilayer structures

2019 ◽  
Vol 482 ◽  
pp. 201-205 ◽  
Author(s):  
Pavel V. Prudnikov ◽  
Vladimir V. Prudnikov ◽  
Marina V. Mamonova ◽  
Natalia I. Piskunova
Keyword(s):  
Multilayer Structures ◽  
Magnetic Multilayer

ChemInform Abstract: Layered Magnetic Structures: Interlayer Exchange Coupling and Giant magnetoresistance

ChemInform ◽  
2010 ◽  
Vol 26 (32) ◽  
pp. no-no
Author(s):  
A. FERT ◽  
P. GRUENBERG ◽  
A. BARTHELEMY ◽  
F. PETROFF ◽  
W. ZINN
Keyword(s):  
Exchange Coupling ◽  
Giant Magnetoresistance ◽  
Interlayer Exchange Coupling ◽  
Magnetic Structures ◽  
Interlayer Exchange

Electronic Structure and Magnetic Properties of Ti-doped ZnO

2009 ◽  
Vol 1183 ◽  
Author(s):  
Soumia Lardjane ◽  
Ghouti Merad ◽  
Houda Imane Faraoun
Keyword(s):  
Density Functional ◽  
Room Temperature ◽  
Magnetic Semiconductor ◽  
Magnetic Element ◽  
Functional Theory ◽  
Magnetic Structures ◽  
Spintronic Devices ◽  
The Density Functional Theory ◽  
Doped Zno ◽  
Ferromagnetic Ordering

AbstractRecent experiments suggest that Ti doped ZnO can be a promising room temperature dilute magnetic semiconductor (DMS) and a potentially useful material for spintronic devices. Furthermore, the fact that Ti doped ZnO shows ferromagnetic behaviour despite it contains no magnetic element makes this system good candidate for theoretical investigation regarding the controversies about the origin of ferromagnetic ordering in TM-doped ZnO. In this work, the density functional theory (DFT) is used to calculate the electronic and magnetic structures of Ti-doped ZnO. The obtained results are used to discuss the origin of the ferromagnetism, and the contribution of different atoms in the magnetic moment.

scholarly journals Half-Metallic Property Induced by Double Exchange Interaction in the Double Perovskite Bi2BB′O6 (B, B′ = 3d Transitional Metal) via First-Principles Calculations

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1844 ◽  
Author(s):  
Hong-Zong Lin ◽  
Chia-Yang Hu ◽  
Po-Han Lee ◽  
Albert Zhong-Ze Yan ◽  
Wen-Fang Wu ◽  
...  
Keyword(s):  
Exchange Interaction ◽  
Density Functional ◽  
Double Exchange ◽  
Double Perovskite ◽  
Transition Metal Ions ◽  
Spin Interaction ◽  
Metallic Materials ◽  
Generalized Gradient ◽  
Double Exchange Interaction ◽  
Half Metallic

In this paper, we identify three possible candidate series of half-metals (HM) from Bi-based double perovskites Bi2BB′O6 (BB′ = transition metal ions) through calculations utilizing the density functional theory (DFT) and full-structural optimization, in which the generalized gradient approximation (GGA) and the strong correlation effect (GGA + U) are considered. After observing the candidate materials under four types of magnetic states, i.e., ferromagnetic (FM), ferrimagnetic (FiM), antiferromagnetic (AF), and nonmagnetic (NM), we found eight promising candidates for half-metallic materials. Under the GGA scheme, there are three ferromagnetic-half-metal (FM-HM) materials, Bi2CrCoO6, Bi2CrNiO6 and Bi2FeNiO6, and three FiM-HM materials, Bi2FeZnO6, Bi2CrZnO6 and Bi2CoZnO6. With implementation of the Coulomb interaction correction (GGA + U), we find two stable half-metallic materials: Bi2CrNiO6 and Bi2CrZnO6. We determine that the stability of some of these materials are tied to the double exchange interaction, an indirect interaction within the higher powers of localized spin interaction among transition metals via oxygen ions. Found in half-metallic materials, and especially those in the ferromagnetic (FM) state, the double exchange interaction is recognized in the FM-HM materials Bi2CrCoO6 and Bi2FeNiO6.

Influence of quantum effects on giant magnetoresistance for multilayer structures

2003 ◽  
Vol 94 (1) ◽  
pp. 507-513 ◽  
Author(s):  
X. H. Zeng ◽  
H. X. Chen ◽  
X. L. Xu ◽  
H. E. Ruda ◽  
Bi Qiao
Keyword(s):  
Giant Magnetoresistance ◽  
Quantum Effects ◽  
Multilayer Structures

scholarly journals Coexistence of glassy antiferromagnetism and giant magnetoresistance in Fe/Cr multilayer structures

2003 ◽  
Vol 263 (1-2) ◽  
pp. 32-37 ◽  
Author(s):  
N. Theodoropoulou ◽  
A.F. Hebard ◽  
M. Gabay ◽  
A.K. Majumdar ◽  
C. Pace ◽  
...  
Keyword(s):  
Giant Magnetoresistance ◽  
Multilayer Structures
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