Indirect Exchange Coupling of Magnetic Moments in Rare-Earth Metals

1971 ◽  
Vol 3 (3) ◽  
pp. 1025-1033 ◽  
Author(s):  
Lawrence Baylor Robinson ◽  
Lloyd N. Ferguson ◽  
Frederick Milstein
Keyword(s):  
Rare Earth ◽  
Exchange Coupling ◽  
Magnetic Moments ◽  
Rare Earth Metals ◽  
Indirect Exchange

scholarly journals The role of ultrafast magnon generation in the magnetization dynamics of rare-earth metals

2020 ◽  
Vol 6 (39) ◽  
pp. eabb1601 ◽  
Author(s):  
B. Frietsch ◽  
A. Donges ◽  
R. Carley ◽  
M. Teichmann ◽  
J. Bowlan ◽  
...  
Keyword(s):  
Rare Earth ◽  
Spin Dynamics ◽  
Magnetic Moments ◽  
Rare Earth Metals ◽  
Ultrafast Dynamics ◽  
Magnetization Dynamics ◽  
Time Resolved ◽  
Spin Lattice ◽  
Dynamics Simulations

Ultrafast demagnetization of rare-earth metals is distinct from that of 3d ferromagnets, as rare-earth magnetism is dominated by localized 4f electrons that cannot be directly excited by an optical laser pulse. Their demagnetization must involve excitation of magnons, driven either through exchange coupling between the 5d6s-itinerant and 4f-localized electrons or by coupling of 4f spins to lattice excitations. Here, we disentangle the ultrafast dynamics of 5d6s and 4f magnetic moments in terbium metal by time-resolved photoemission spectroscopy. We show that the demagnetization time of the Tb 4f magnetic moments of 400 fs is set by 4f spin–lattice coupling. This is experimentally evidenced by a comparison to ferromagnetic gadolinium and supported by orbital-resolved spin dynamics simulations. Our findings establish coupling of the 4f spins to the lattice via the orbital momentum as an essential mechanism driving magnetization dynamics via ultrafast magnon generation in technically relevant materials with strong magnetic anisotropy.

Indirect exchange interaction in a thin film of rare-earth metals

1992 ◽  
Vol 46 (20) ◽  
pp. 13501-13508 ◽  
Author(s):  
Hao Che ◽  
D. L. Lin ◽  
Yu Xia ◽  
Hang Zheng ◽  
H. X. Li
Keyword(s):  
Thin Film ◽  
Rare Earth ◽  
Exchange Interaction ◽  
Rare Earth Metals ◽  
Indirect Exchange Interaction ◽  
Indirect Exchange

Theory of Indirect Exchange Interactions in Rare-Earth Metals

1963 ◽  
Vol 129 (5) ◽  
pp. 2072-2086 ◽  
Author(s):  
T. A. Kaplan ◽  
D. H. Lyons
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Exchange Interactions ◽  
Indirect Exchange

AB INITIO CALCULATION OF MAGNETIC MOMENTS, HYPERFINE FIELDS, MAGNETIC ANISOTROPY AND EXCHANGE INTERACTIONS IN RARE-EARTH INTERMETALLICS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 710-715 ◽  
Author(s):  
K. HUMMLER ◽  
M. LIEBS ◽  
T. BEUERLE ◽  
M. FÄHNLE
Keyword(s):  
Rare Earth ◽  
Magnetic Anisotropy ◽  
Exchange Coupling ◽  
Magnetic Moments ◽  
Exchange Interactions ◽  
Orbital Method ◽  
Local Spin Density Approximation ◽  
Hyperfine Fields ◽  
Atomic Sphere ◽  
Sphere Approximation

The intrinsic magnetic properties of R2Fe14B (R=Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb) are calculated from first principles within the local-spin-density approximation and the linear-muffin-tin-orbital method in atomic-sphere approximation. The total magnetization is in excellent agreement with experimental data. The local magnetic moments of the crystallographically inequivalent Fe sites appear to be not proportional to the local hyperfine fields. It is shown that the rare-earth contribution to the magnetic anisotropy may be qualitatively related to the electrostatic interaction of the aspherical 4f charge density with the crystal field. The effective intersublattice exchange coupling is evaluated from the change of the total energy upon 4f spin reversion.

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