New Type of Oscillatory Exchange Coupling Induced by Ordering in the Magnetic Layers

1996 ◽  
Vol 76 (20) ◽  
pp. 3834-3837 ◽  
Author(s):  
J. Kudrnovský ◽  
V. Drchal ◽  
C. Blaas ◽  
I. Turek ◽  
P. Weinberger
Keyword(s):  
Exchange Coupling ◽  
Magnetic Layers ◽  
New Type

Observation of an Exponential FeSi Spacer Thickness Dependence of the Antiferromagnetic Exchange Coupling in Fe/Si-Based Multilayers

1997 ◽  
Vol 475 ◽  
Author(s):  
J.T. Kohlhepp ◽  
J.J. De Vries ◽  
F.J.A. Den Broeder ◽  
R. Coehoorn ◽  
R.M. Jungblut ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Room Temperature ◽  
Decay Length ◽  
Antiferromagnetic Exchange ◽  
Interlayer Exchange Coupling ◽  
Magnetic Layers ◽  
Magnetic Analysis ◽  
Spacer Thickness ◽  
Interlayer Exchange ◽  
B2 Structure

ABSTRACTThe magnetic interlayer exchange coupling in Fe/Si-based thin film structures employing sputtered multilayers with variations of Si-alloyed Fe for the magnetic layers and Fe-alloyed Si spacers, as well as wedge-shaped MBE-grown Fe/Si/Fe sandwich samples has been systematically studied. From structural and magnetic analysis it is concluded that ultrathin Si and FexSi100-x (x < 50) spacer layers transform into a crystalline iron suicide with a composition close to Fe50Si50. The exchange coupling mediated by this metallic suicide is antiferromagnetic and depends on the spacer thickness in an exponential, i.e. non-oscillatory, manner with a universial characteristic decay length of 3–4 Å at room temperature. This observation can be qualitatively explained within the framework of a recent coupling theory on the premise that the FeSi interlayer has the metastable CsCl(B2)-structure.

Theory of Oscillatory Exchange Between Magnetic Layers Through a Nonmagnetic Transition–Metal Spacer

1991 ◽  
Vol 231 ◽  
Author(s):  
J. Mathon
Keyword(s):  
Transition Metal ◽  
General Theory ◽  
Fermi Surface ◽  
Temperature Dependence ◽  
Exchange Coupling ◽  
Asymptotic Decay ◽  
Close Analogy ◽  
Magnetic Layers ◽  
Spacer Layer

AbstractA general theory of oscillations in the exchange coupling between two transition metal ferromagnets separated by a nonmagnetic transition metal spacer is developed. A close analogy between oscillations in the exchange coupling and de Haas-van Alphen oscillations is established and exploited to show that the period, asymptotic decay, and temperature dependence of the oscillations are determined by properties of the d band Fermi surface in the spacer layer. The theory accounts qualitatively and even semiquantitatively for all the salient experimental features of the oscillations in the exchange coupling observed recently in Co/Ru, Co/Cr, and Fe/Cr superlattices.

The Influence of Si on Magnetic and Magneto-Optical Properties of Co/Si/Co Thin-Film Systems

2015 ◽  
Vol 233-234 ◽  
pp. 653-656 ◽  
Author(s):  
Elena E. Shalygina ◽  
Elena A. Gan’shina ◽  
Anna M. Kharlamova ◽  
Aleksander N. Mukhin ◽  
Galina V. Kurlyandskaya ◽  
...  
Keyword(s):  
Thin Film ◽  
Optical Properties ◽  
Magnetron Sputtering ◽  
Layer Thickness ◽  
Exchange Coupling ◽  
Structural Features ◽  
Magnetic Saturation ◽  
Antiferromagnetic Exchange ◽  
Saturation Field ◽  
Magnetic Layers

The magnetic and magneto-optical properties of the Co/Si/Co thin-film samples obtained by magnetron sputtering were investigated employing magnetooptical techniques. The thickness of the Co layers was equal to 5 nm, and Si layer thickness varied in the interval of 0.2 to 3.2 nm. The magnetic saturation field of the samples under study was found to oscillate in the magnitude with the change of the Si layer thickness. This result was explained by structural features of the Co/Si/Co multilayers and the presence of the antiferromagnetic exchange coupling between magnetic layers via the silicon interlayer. The peculiarities of the magneto-optical spectra of the Co/Si/Co samples were measured and discussed.

scholarly journals Nanocomposite permanent magnetic materials Nd-Fe-B type: The influence of nanocomposite on magnetic properties

2005 ◽  
Vol 41 (1) ◽  
pp. 95-102 ◽  
Author(s):  
Nadezda Talijan ◽  
Jasna Stajic-Trosic ◽  
Aleksandar Grujic ◽  
Vladan Cosovic ◽  
Vladimir Menushenkov ◽  
...  
Keyword(s):  
Magnetic Material ◽  
Heat Treatment ◽  
Magnetic Properties ◽  
Permanent Magnet ◽  
Exchange Coupling ◽  
Coupling Effect ◽  
Soft Magnetic ◽  
Magnetic Phases ◽  
New Type ◽  
Permanent Magnet Materials

The influence on the magnetic properties of nanocristalline ribbons and powders has character of microstructure, between others ? the grain size volume of hard and soft magnetic phases and their distribution. Magnetic properties of ribbons and powders depend mainly on their chemical composition and parameters of their heat treatment [1]. Technology of magnets from nanocristalline ribbon consists of the following process: preparing the Nd-Fe- B alloy, preparing the ribbon, powdering of the ribbon, heat treatment of the powder and finally preparing the magnets. Nanocomposite permanent magnet materials based on Nd-Fe- B alloy with Nd low content are a new type of permanent magnetic material. The microstructure of this nanocomposite permanent magnet is composed of a mixture of magnetically soft and hard phases which provide so called exchange coupling effect.

Magnetoresistance and Interlayer Exchange Coupling between Magnetic Layers in Fe–Mn/Ni–Fe–Co/Cu/Ni–Fe–Co Multilayers

1994 ◽  
Vol 33 (Part 1, No. 3A) ◽  
pp. 1327-1333 ◽  
Author(s):  
Katsumi Hoshino ◽  
Shin Noguchi ◽  
Ryoichi Nakatani ◽  
Hiroyuki Hoshiya ◽  
Yutaka Sugita
Keyword(s):  
Exchange Coupling ◽  
Interlayer Exchange Coupling ◽  
Magnetic Layers ◽  
Interlayer Exchange

scholarly journals Natural van der Waals heterostructural single crystals with both magnetic and topological properties

2019 ◽  
Vol 5 (11) ◽  
pp. eaax9989 ◽  
Author(s):  
Jiazhen Wu ◽  
Fucai Liu ◽  
Masato Sasase ◽  
Koichiro Ienaga ◽  
Yukiko Obata ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Hall Effect ◽  
Exchange Coupling ◽  
Van Der Waals ◽  
Surface States ◽  
Anomalous Hall Effect ◽  
Topological Quantum ◽  
Magnetic Layers ◽  
Topological Surface ◽  
Ferromagnetic Hysteresis

Heterostructures having both magnetism and topology are promising materials for the realization of exotic topological quantum states while challenging in synthesis and engineering. Here, we report natural magnetic van der Waals heterostructures of (MnBi2Te4)m(Bi2Te3)n that exhibit controllable magnetic properties while maintaining their topological surface states. The interlayer antiferromagnetic exchange coupling is gradually weakened as the separation of magnetic layers increases, and an anomalous Hall effect that is well coupled with magnetization and shows ferromagnetic hysteresis was observed below 5 K. The obtained homogeneous heterostructure with atomically sharp interface and intrinsic magnetic properties will be an ideal platform for studying the quantum anomalous Hall effect, axion insulator states, and the topological magnetoelectric effect.

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