A simple experiment is described to demonstrate the different deflected shapes assumed by a cantilever due to a torque or a force acting on its end. An optical deflection technique is used to show that different shapes appear in the cantilever even if the torque or force causes an identical displacement of the cantilever end.

1.
S.
Foner
, “
Review of mangetometry
,”
IEEE Trans. Magn.
17
,
3558
3363
(
1981
).
2.
IBS Magnet, Model No. NE88, Kurfürstenstr. 92, D-12105 Berlin, Germany.
3.
JDS Uniphase, Model No. 1108P, www.jdsunph.com.
4.
R. J. Roark, Formulas for Stress and Strain, 6th ed. (McGraw-Hill, Singapore, 1989).
5.
M.
Weber
,
R.
Koch
, and
K. H.
Rieder
, “
UHV cantilever beam technique for quantitative measurements of magnetism
,”
Phys. Rev. Lett.
73
,
1166
1169
(
1994
).
6.
D.
Sander
,
A.
Enders
, and
J.
Kirschner
, “
Magnetization, magnetostriction and film stress of Fe monolayers on W(100)
,”
IEEE Trans. Magn.
34
,
2015
2017
(
1998
).
7.
Th. Hopfl, Ph.D. thesis, Martin-Luther-Universität, Halle, Wittenberg, 2000.
8.
Th.
Höpfl
,
D.
Sander
,
H.
Höche
, and
J.
Kirschner
, “
Ultrahigh vacuum cantilever magnetometry with standard size single crystal substrates
,”
Rev. Sci. Instrum.
72
,
1495
1501
(
2001
).
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