LOCAL MODES AROUND THE FERROMAGNETIC IMPURITIES IN THE TWO-DIMENSIONAL HEISENBERG ANTIFERROMAGNETS

2001 ◽  
Vol 15 (08) ◽  
pp. 243-251
Author(s):  
YUN SONG
Keyword(s):  
Spin Wave ◽  
Green's Function ◽  
Nearest Neighbor ◽  
Numerical Procedure ◽  
Two Dimensional ◽  
Local Modes ◽  
Spin Wave Excitations ◽  
Ferromagnetic Domains ◽  
Double Time ◽  
Heisenberg Antiferromagnets

The behaviors of the spin-wave excitations around the ferromagnetic impurities in the two-dimensional spin-1/2 Heisenberg antiferromagnets are investigated for the cases with one, two and four impurities respectively. By means of the double-time Green's function numerical procedure, it is found that, in the two impurity case, two ferromagnetic impurities prefer to form an effective singlet. While in the four impurity case we obtained that, two nearest-neighbor ferromagnetic domains with contrary spin directions are formed in the antiferromagnetic background, and thus the whole system has the lowest energy.

Spin-Wave Excitations in Manganese Carbonate

1972 ◽  
Vol 50 (7) ◽  
pp. 687-691 ◽  
Author(s):  
T. M. Holden ◽  
E. C. Svensson ◽  
P. Martel
Keyword(s):  
Inelastic Scattering ◽  
Spin Wave ◽  
Experimental Error ◽  
Nearest Neighbor ◽  
Exchange Interactions ◽  
Manganese Carbonate ◽  
Neutron Inelastic Scattering ◽  
Spin Wave Excitations ◽  
Order Of Magnitude ◽  
Maximum Spin

The dispersion curves for spin waves propagating along the [0, 0, ζ], [ζ, ζ, ζ, 0], [ζ, ζ, ζ], [–ζ, –ζ, 2ζ], and [ζ, ζ, 1.5–2ζ] directions in MnCO3 at 4.6 °K have been determined by neutron inelastic scattering. The maximum spin-wave frequency is 0.95 ± 0.02 THz. Theoretical expressions for the spin-wave frequencies in MnCO3 are developed, and the interatomic exchange interactions determined by least-squares analysis. The dominant exchange interaction is the nearest-neighbor intersublattice interaction, J1 = −0.0290 ± 0.0011 THz. The next-nearest-neighbor intersublattice interaction, J2 = −0.0029 ± 0.0004 THz, and the nearest-neighbor intrasublattice interaction, [Formula: see text], are almost an order of magnitude smaller, and other interactions are negligible within experimental error.

Two‐dimensional spin‐wave excitations in MBE‐grown Fe(110)/Ag(111) multilayers

1991 ◽  
Vol 69 (8) ◽  
pp. 5286-5288 ◽  
Author(s):  
Z. Q. Qiu ◽  
C. J. Gutierrez ◽  
M. D. Wieczorek ◽  
H. Tang ◽  
R. C. Mercader ◽  
...  
Keyword(s):  
Spin Wave ◽  
Two Dimensional ◽  
Spin Wave Excitations

SPIN WAVE ANALYSIS OF THE TWO-DIMENSIONAL HEISENBERG ANTIFERROMAGNETS Rb2MnCl4 AND (CH3NH3)2MnCl4

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-753-C6-754
Author(s):  
B. Schröder ◽  
V. Wagner ◽  
N. Lehner ◽  
R. Geick
Keyword(s):  
Spin Wave ◽  
Two Dimensional ◽  
Wave Analysis ◽  
Heisenberg Antiferromagnets

Magnons

2017 ◽  
Author(s):  
Olle Eriksson ◽  
Anders Bergman ◽  
Lars Bergqvist ◽  
Johan Hellsvik
Keyword(s):  
Spin Wave ◽  
Spin Dynamics ◽  
Multiscale Approach ◽  
Two Dimensional ◽  
Bulk Properties ◽  
Spin Wave Excitations

In this chapter we give several examples of how the multiscale approach for atomistic spin-dynamics, as described in Part I and Part II of this book, performs for describing magnon excitations of solids. Due to the recent experimental advancements in detecting such excitations for surfaces and multilayers, we focus here primarily on spin wave excitations of two-dimensional systems. The discussion can easily be generalized to bulk magnets, and in fact some examples of bulk properties are given in this chapter as well. Magnons can be categorized as dipolar and exchange magnons, where the latter are in the range of giga Hz frequency, and are the main focus of this chapter.

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