• Non ci sono risultati.

Notation and Units. In SI units, the Gilbert equation reads

N/A
N/A
Info
Scarica
Protected

Academic year: 2021

Condividi "Notation and Units. In SI units, the Gilbert equation reads"

Copied!
1
0
0

Caricamento.... (Visualizza il testo completo ora)

Scarica adesso ( 1 pagine )

Testo completo

(1)

Appendix

Notation and Units. In SI units, the Gilbert equation reads

γ

e−1

m = μ ˙

0

m × H , (3.168) where γ

e

= g q

e

/m

e

is the gyromagnetic ratio, q

e

< 0 is the signed electron charge, m

e

is the electron mass and g > 0 is the Land´ e factor ; μ

0

denotes the magnetic permeability of the vacuum, and

H = −(μ

0

M

s

)

−1

δ

m

Φ , (3.169) is the effective field, with M

s

the saturation magnetization and Φ the Gibbs free energy. The standard free energy is written as

Φ =



Ω

φ , (3.170)

with

φ = A |∇m|

2

− K(e · m)

2

− μ

0

M

s

( 1

2 H

s

+ H

e

) · m ,

where H

s

and H

e

are, respectively, the stray field and the external magnetic field, A is the exchange constant and K is the anisotropy constant.

Our notation is recovered upon defining the dimensionless quantities ψ = (μ

0

M

s2

)

−1

φ ,

β = 2(μ

0

M

s2

)

−1

K , h = M

s−1

H , h

s

= M

s−1

H

s

, h

e

= M

s−1

H

e

,

(3.171)

and

α = 2(μ

0

M

s2

)

−1

A ,

γ = M

s

μ

0

γ

e

(3.172)

which have, respectively, the dimensions of (length)

2

and (time)

−1

.

51

Riferimenti

Scarica adesso ( PDF - 1 pagine - 67.11 KB )

Documenti correlati

Units derived from

Alluvial and megafan deposits (Upper Pleistocene) Depositi fluviali e di megaconoide.

‘hrtially Notation < incidente [lo],

In Section 3, we explain how a version of Gleason’s theorem can be used to obtain the weight enumerator of an extension of the code of the plane of order 5 by knowing the numbers

Infection on the Neonatal and Pediatric Intensive Care Units

Finally, lower overall mortality rates of 5% [9] support the observation that children on a PICU are less susceptible hosts compared with the 10% mortality in neonates

3| WORDS AND UNITS: ORTHOGRAPHY AND PUNCTUATION

The most commonly used punctuation marks in scientific texts are the comma and period (called a “full stop” in British English).. After a period, there is a single space, contrary

Conversions of D and H between SI and Gaussian Units

431 of [12] where the different forms of Maxwell’s equations for D, B and H in Gaussian and SI units (p. 427) are characterized by saying that these fields are “different

Labanotation: a universal movement notation language

As Ann Hutchinson wrote (2): “the creation of a notation system involves many personal aspects of those who elaborate that system: their experiences, their research and

Labanotation: a universal movement notation language

La notazione prevede l’uso di ulteriori simboli oltre a quello di base e alle sue modificazioni per consentire di precisare la descrizione con tutte le forme di flessione,

3.1.1 Woods Notation

Many atoms and molecules form ordered adsorbate layers (adlayers) on a low index surface at certain temperatures.. Commensurate - well-defined relationship to substrate