?
?
1
]
(In the formula, D (0.2 N) and D (1.0 N) each represent the width of the sample
10S in a case where the loads of 0.2 N and 1.0 N are applied in the longitudinal direction of the sample
10S.)
Note that the width of the sample 10S in a case where each load is applied is measured as follows. First, the measuring device shown in FIG. 3 in which a digital dimension measuring instrument LS-7000 manufactured by Keyence Corporation is incorporated is prepared as a measuring device, and the sample 10S is set in this measuring apparatus. Specifically, one end of the elongated sample (magnetic recording medium) 10S is fixed by a fixing part 231, and the sample 10S is put over a plurality of rod-shaped support members 232. Note that among the support members 232, the support member 232 located between a light emitter 234 and a light receiver 235 is provided with a slit 232A such that light L is emitted from the light emitter 234 to the light receiver 235 through the slit 232A.
