We show that ferromagnetic resonance (FMR) selectively transfers angular momentum and energy from a microwave field to the lattice as measurable torque and heat. The expected torque and absorbed power are derived classically in terms of Landau–Lifshitz dynamics, including demagnetizing field effects. The torque is also described as a photon absorption process, in which the absorbed photons carry both energy and angular momentum. FMR data are shown for a thin NiFe film deposited on a micromechanical cantilever detector that measures both torque and heat under nearly identical conditions.

Topics
Electromagnetism, Ferromagnetic resonance
1.
G. Alzetta and A. Gozzini, in Proceedings of the XII Colloque Ampere (North Holland, Amsterdam, 1964), p. 82.
2.
A. Gozzini, in Ref. 1, p. 209.
3.
E.
Arimondo
,
Nuovo Cimento B
52
,
379
(
1967
).
Google Scholar
 
4.
G.
Alzetta
,
E.
Arimondo
,
C.
Ascoli
, and
A.
Gozzini
,
Nuovo Cimento B
52
,
392
(
1967
).
Google Scholar
 
5.
G.
Alzetta
,
E.
Arimondo
, and
C.
Ascoli
,
Nuovo Cimento B
54
,
107
(
1968
).
Google Scholar
 
6.
C.
Ascoli
,
P.
Baschieri
,
C.
Frediani
,
L.
Lenci
,
M.
Martinelli
,
G.
Alzetta
,
R. M.
Celli
, and
L.
Pardi
,
Appl. Phys. Lett.
69
,
3920
(
1996
).
Google Scholar
 
7.
J.
Schmidt
and
I.
Solomon
,
J. Appl. Phys.
37
,
3719
(
1996
).
Google Scholar
 
8.
W. S.
Moore
and
T. M.
Al-Sharbati
,
J. Phys. D
6
,
367
(
1973
).
Google Scholar
 
9.
J.
Moreland
,
M.
Löhndorf
,
P.
Kabos
, and
R. D.
McMichael
,
Rev. Sci. Instrum.
71
,
3099
(
2000
).
Google Scholar
 
10.
O.
Benda
,
IEEE Trans. Magn.
5
,
921
(
1969
).
Google Scholar
 
11.
C. E. Patton, in Magnetic Oxides, edited by D. J. Craik (Wiley, London, 1975), Chap. 10.
12.
B.
Heinrich
and
J. F.
Cochran
,
Adv. Phys.
42
,
523
(
1993
).
Google Scholar
 
13.
C. Vittoria, Microwave Properties of Magnetic Films (World Scientific, Singapore, 1993).
14.
M.
Löhndorf
,
J.
Moreland
,
P.
Kabos
, and
N.
Rizzo
,
J. Appl. Phys.
87
,
5995
(
2000
).
Google Scholar
 
15.
M.
Löhndorf
,
J.
Moreland
, and
P.
Kabos
,
Appl. Phys. Lett.
76
,
1176
(
2000
).
Google Scholar
 
16.
M.
Willemin
,
C.
Rossel
,
J.
Brugger
,
M. H.
Dspont
,
H.
Rothuizen
,
P.
Vettiger
,
J.
Hofer
, and
H.
Keller
,
J. Appl. Phys.
83
,
1163
(
1998
).
Google Scholar
 
17.
J.
Moreland
,
P.
Kabos
,
A.
Jander
,
M.
Löhndorf
,
R. D.
McMichael
, and
C.-G.
Lee
,
Proc. SPIE
4176
,
84
(
2000
).
Google Scholar
 
This content is only available via PDF.
© 2001 American Institute of Physics.
2001
American Institute of Physics
You do not currently have access to this content.