MAGNETISM ELECTRON TRANSPORT MAGNETORESISTIVE LANTHANUM CALCIUM MANGANITE
MAGNETISM ELECTRON TRANSPORT MAGNETORESISTIVE LANTHANUM CALCIUM MANGANITE
MAGNETISM ELECTRON TRANSPORT MAGNETORESISTIVE LANTHANUM CALCIUM MANGANITE
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Moment (emu)<br />
0.234<br />
0.233<br />
0.232<br />
0.231<br />
0.230<br />
0.229<br />
0.228<br />
Electronic and Magnetic Measurements 43<br />
Sample Rotation<br />
0.227<br />
0 50 100 150 200 250 300 350<br />
Rotation Angle (°)<br />
Figure 3-2 Magnetization of YIG sample as it is rotated along<br />
the field axis.<br />
3.2.2 Analysis<br />
The important quantities in magnetic measurements are the magnetic<br />
field vector H, measured in Oersted and the magnetization intensity (or<br />
simply the magnetization) M, measured in emu/volume (electromagnetic<br />
unit = erg/Oersted). M is often reported in units of emu/g, emu/mole or<br />
Bohr magnetons (μ B ) per magnetic atom. The magnetic induction field B<br />
measured in gauss, defined by B = H + 4π M, is often considered more<br />
fundamental in physics. The above units are CGS units which are more<br />
prevalent than MKS since the equations tend to be simpler. The MKS unit<br />
which is used commonly in the magnetic literature is the Tesla = 10000 gauss.<br />
Most materials have a magnetization proportional to the applied field.<br />
The magnetic susceptibility χ, defined by M = χH, relates these two quantities.<br />
It is convenient to use χ = M/H, for non-ferromagnetic and isotropic
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