Anisotropy constant and exchange coupling strength of perpendicularly magnetized CoFeB/Pd multilayers and exchange springs

2017 ◽  
Vol 95 (14) ◽  
Author(s):  
A. F. Franco ◽  
C. Gonzalez-Fuentes ◽  
J. Åkerman ◽  
C. Garcia
Keyword(s):  
Coupling Strength ◽  
Exchange Coupling ◽  
Anisotropy Constant

Exchange Bias in CrO2/Cr2O3 Bilayer Thin Films

2006 ◽  
Vol 45 ◽  
pp. 2528-2533 ◽  
Author(s):  
S. Srinath ◽  
N.A. Frey ◽  
H. Srikanth ◽  
G.X. Miao ◽  
A. Gupta
Keyword(s):  
Thin Films ◽  
Magnetic Anisotropy ◽  
Variable Thickness ◽  
Exchange Bias ◽  
Exchange Coupling ◽  
Hysteresis Loops ◽  
Anisotropy Constant ◽  
Effective Magnetic Anisotropy ◽  
Large Anisotropy

We have investigated the exchange bias in CVD grown epitaxial CrO2/Cr2O3 bilayer thin films using hysteresis loops and resonant RF transverse susceptibility. M-H loops indicated an enhanced coercivity without appreciable loop shift and the transverse susceptibility in CrO2/Cr2O3 bilayers revealed features associated with both the ferromagnetic and antiferromagnetic phases. In addition, TS yielded large anisotropy constant (Keff) values depending on the fraction of Cr2O3 present. The large anisotropy fields observed cannot be accounted for by the variable thickness of CrO2 alone and are indicative of possible exchange coupling between CrO2 and Cr2O3 phases that significantly affects the effective magnetic anisotropy.

AB-INITIO BAND STRUCTURE CALCULATION FOR MAGNETIC MULTILAYERS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 456-459 ◽  
Author(s):  
J. STICHT ◽  
F. HERMAN ◽  
J. KÜBLER
Keyword(s):  
Magnetic Properties ◽  
Band Structure ◽  
Total Energy ◽  
Ab Initio ◽  
Coupling Strength ◽  
First Principles ◽  
Exchange Coupling ◽  
Magnetic Multilayers ◽  
Structure Calculation ◽  
Band Structure Calculation

The magnetic properties of magnetic multilayers are studied using first principles total energy calculations. In this paper we present our results for bcc Fe multilayers with a (001) stacking direction. Using Nb as a spacer material we find an oscillating exchange coupling with a period of about 4.6 Å( ≈3 Nb monolayers). A detailed study of the magetic moments in the Nb spacer is given. Furthermore we discuss the dependence of the exchange coupling strength as a function of the thickness of the Fe slabs.

Studies of Exchange Coupling in Fe (001) Whisker/Cr/Fe Structures using BLS and Rheed Techniques.

1993 ◽  
Vol 313 ◽  
Author(s):  
B. Heinrich ◽  
M. From ◽  
J.F. Cochran ◽  
L. X. Liao ◽  
Z. Celiński ◽  
...  
Keyword(s):  
Coupling Strength ◽  
Exchange Coupling ◽  
High Energy ◽  
Variable Number ◽  
Antiferromagnetic Coupling ◽  
Iron Film ◽  
First Principles Calculations ◽  
Iron Whisker ◽  
Short Period ◽  
Coupling Strengths

ABSTRACTThe conditions for an almost perfect growth of smooth Cr (001) films on an iron whisker substrate have been investigated by means of reflection high energy electron diffraction (RHEED). The exchange interaction between 20 Monolayer thick Fe (001) films separated from a bulk whisker Fe (001) substrate by a variable number of Cr (001) Monolayers (ML) has been investigated by means of Brillouin light scattering experiments (BLS). These experiments show unambiguously that the exchange coupling strength between the iron film and the iron whisker can be described by a short wavelength oscillatory term superposed on a slowly varying antiferromagnetic background. The BLS data enabled one to separate the bilinear and the biquadratic contributions to the antiferromagnetic exchange coupling terms. Both the bilinear and the biquadratic coupling strengths exhibited a short period oscillatory dependence on the Cr interlayer thickness (∼2 Monolayers). Maxima in the bilinear antiferromagnetic coupling strength occur for an odd number of Cr Monolayers. This observation is not in agreement with first principles calculations. The first phase inversion has been found to occur between 4 and 5 ML of Cr.

scholarly journals Modulation of interlayer exchange coupling strength in magnetic tunnel junctions via strain effect

AIP Advances ◽  
2015 ◽  
Vol 5 (9) ◽  
pp. 097221 ◽  
Author(s):  
Xin Jiang ◽  
Zhipeng Li ◽  
Yuankai Zheng ◽  
Christian Kaiser ◽  
Zhitao Diao ◽  
...  
Keyword(s):  
Coupling Strength ◽  
Exchange Coupling ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Strain Effect ◽  
Interlayer Exchange Coupling ◽  
Interlayer Exchange

Exchange coupling strength in synthetic ferrimagnetic media

2001 ◽  
Vol 37 (4) ◽  
pp. 1449-1451 ◽  
Author(s):  
A. Inomata ◽  
E.N. Abarra ◽  
B.R. Acharya ◽  
H. Akimoto ◽  
I. Okamoto
Keyword(s):  
Coupling Strength ◽  
Exchange Coupling

Exchange-Coupling Interaction and Effective Anisotropy in Two-Phase Nanocomposite Permanent Magnetic Materials

2005 ◽  
Vol 475-479 ◽  
pp. 2173-2176
Author(s):  
L.M. Liu ◽  
Wei Chen ◽  
M.G. Zhu ◽  
L.Y. Nie ◽  
Ai Jun Li ◽  
...  
Keyword(s):  
Grain Size ◽  
Exchange Coupling ◽  
Coupling Model ◽  
Anisotropy Constant ◽  
Two Phase ◽  
Effective Anisotropy ◽  
Coupling Interaction ◽  
Effective Anisotropy Constant ◽  
Calculation Results ◽  
Exchange Coupling Interaction

Using the part exchange-coupling model, the exchange-coupling interaction between magnetically soft and hard grains in Nd2Fe14B/α-Fe nanocomposite and its effect on the effective anisotropy of the material have been investigated. By testing six different functions, series curves of effective anisotropy constant versus the mean grain size were obtained. The calculation results show that the effective anisotropy of the composite increases slightly with decreasing grain size, reaches the maximum at about 23nm, and then decreases abruptly. The calculated curves resemble the experimental results of the coercivity versus grain size in nanocomposite.

The Effects of Magnetic Properties of L10-FePt/Fe Based Exchange Coupled Composite Media on Switching Field

2014 ◽  
Vol 931-932 ◽  
pp. 271-275 ◽  
Author(s):  
Warunee Tipcharoen ◽  
Arkom Kaewrawang ◽  
Apirat Siritaratiwat ◽  
Kittipong Tonmitra
Keyword(s):  
Magnetic Properties ◽  
Magnetic Recording ◽  
Exchange Coupling ◽  
Magnetocrystalline Anisotropy ◽  
Areal Density ◽  
Anisotropy Constant ◽  
Recording System ◽  
Switching Field ◽  
Magnetic Parameters ◽  
Exchange Coupled Composite

The L10-FePt/Fe based exchange coupled composite (ECC) bilayer media is one candidate to extend the areal density of magnetic recording system and solve writability issue in trilemma. L10-FePt is the great high magnetic anisotropy material. Therefore, the magnetic parameters of this material such as magnetocrystalline anisotropy constant, Ku, saturation magnetization, Ms, and exchange coupling between a soft/hard interface, are important on magnetic material properties. In this work, the effects of magnetic parameters on magnetic properties of L10-FePt/Fe based ECC bilayer media are simulated by the object oriented micromagnetic framework based on Landau-Lifshitz-Gilbert equation. The ECC bilayer media can reduce switching field, Hsw, of media lower than available writing head field. Hence, writability issues of high Ku media can be achieved. Reducing Hsw of ECC bilayer media obtains from lower Ku and higher Ms values. This work can achieve writing capability of a future magnetic recording system.

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