Magnetic recording medium, method of producing the same, and magnetic storage apparatus

39 Pages·2013·2.77 MB·English

US 20060177702A1
(19) United States
(12) Patent Application Publication (10) Pub. N0.2 US 2006/0177702 A1
Ajan (43) Pub. Date: Aug. 10, 2006
(54) MAGNETIC RECORDING MEDIUM, (30) Foreign Application Priority Data
METHOD OF PRODUCING THE SAME, AND
MAGNETIC STORAGE APPARATUS Feb. 4, 2005 (JP) .................................... .. 2005-029558
Nov. 25, 2005 (JP) .................................... .. 2005-340407
75 l t : A t A’ K ki JP
( ) nven or n (my Jan’ awasa ( ) Publication Classi?cation
Correspondence Address: (51) Int- Cl‘
Pamck G‘ Burns G11B 5/66 (2006 01)
SGBEIZISQBEURNS 8‘ CRAIN’ LTD‘ B05D 5/12 (2006.01)
“"6 _ G11B 5/74 (2006.01)
309 south Wacker Dnve (52) us. Cl. ............. .. 428/8281; 428/8312; 428/8361;
chug", IL 60606 (Us) 427/127; 360/110; 360/131
(21) Appl. No.: 11/346,656 A magnetic recording medium is provided With an orienta
tion control layer and an underlayer disposed above the
(22) Filed: Feb. 3, 2006 substrate, an underlayer disposed above the orientation
control layer, and a recording layer having an hcp crystal
Related US. Application Data structure and disposed on a surface of the underlayer. A part
of the recording layer is epitaxially groWn on the surface of
(63) Continuation-in-part of application No. 11/211,051, the underlayer and has c-axes that are inclined With respect
?led on Aug. 24, 2005. to a surface of the substrate.
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Patent Application Publication Aug. 10, 2006 Sheet 1 0f 16 US 2006/0177702 A1
FIG.1A
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146A
146A 143
Patent Application Publication Aug. 10, 2006 Sheet 2 0f 16 US 2006/0177702 A1
FIG.2A FIG.2B
FIG.2C FIG.2D
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FIG.2E
Patent Application Publication Aug. 10, 2006 Sheet 3 0f 16 US 2006/0177702 A1
FIG.3A
FIG.3B
9 (DEGREES)
Patent Application Publication Aug. 10, 2006 Sheet 4 0f 16 US 2006/0177702 A1
FIG.4
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Patent Application Publication Aug. 10, 2006 Sheet 6 0f 16 US 2006/0177702 A1
‘FIG.7
400
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FIG.8
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MAGNETIZATION,
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U(ANRBIITTRSAR)Y PE-RPENDICULAR
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. . . . q . . _ _ _ _ _ _ . . . . 1 . . . . . . L _ _ . . ._
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Illlillllillll
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APPLIED MAGNETIC FIELD
(kOe)

Patent Application Publication Aug. 10, 2006 Sheet 8 0f 16 US 2006/0177702 A1
FIG.11
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Patent Application Publication Aug. 10, 2006 Sheet 9 0f 16 US 2006/0177702 A1
FIG.13
~28
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~23
45a 45a 45a
45md
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FIG.14
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